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1
Seamark, Robert F. "Biotech prospects for the control of introduced mammals in Australia." Reproduction, Fertility and Development 13, no. 8 (2001): 705. http://dx.doi.org/10.1071/rd01073.
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More than twenty exotic vertebrate species are now listed as pests in Australia. Collectively, these pests have a huge economic and environmental impact and pose a major threat to Australia’s ecosystems and unique biodiversity. Management of such pests on a continental scale is a major challenge. Recent advances in biotechnology suggest alternatives to the lethal diseases normally sought for use as biological control agents. One proposal, being investigated in the Pest Animal Control Cooperative Research Centre, Canberra, is the use of biotechnology to develop a new generation of agents that act through controlling reproduction to prevent the build up of pest populations. The core concept is fertility control through immunocontraceptive vaccines delivered by viruses that specifically infect the target pest population. Proof of this exciting concept has been obtained for the mouse and, very recently, the rabbit, and a candidate vaccine vector identified for the fox, portending better control of a trio of Australia’s most pervasive pests. Other advances in biotechnology suggest ways to negate the build up of both innate and acquired immune resistance in target pest populations that normally act to limit the efficacy and effective life of biocontrol agents in the field. Prospects for extending the use of virally vectored vaccines to the field management of wildlife diseases are also identified. Targets for such vaccines include a growing suite of emerging diseases, hosted by Australia’s wildlife, which pose a threat to human and livestock health. Numerous technical challenges remain to be addressed before any of these new agents are ready for use in the field. However, the major risk to their development is now no longer viewed as being technical, but the failure to gain public acceptance for their use in the field. This already significant risk is exasperated by the present heightened level of public concern about all introductions of genetically modified organisms.
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Ko, Alexander E. "Urban Entomology Highlights From 2020—Monitoring and Control of Urban Pests." Journal of Medical Entomology 58, no. 5 (August 3, 2021): 2012–15. http://dx.doi.org/10.1093/jme/tjab119.
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Abstract Pest management professionals aim to answer two primary questions for their customers: 1) ‘Where/What is the pest?’ and 2) ‘How do I kill it?’. These two questions drive at the core of any pest management program. 2020 was an exciting year for entomology research, with much work being done on novel technologies and methods for detecting and controlling pests. The objectives of the current publication were to discuss papers published in 2020 that addressed the key pest management objectives of 1) monitoring and 2) controlling pest populations.
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Whalen, Joann K., Shiv O. Prasher, and Hicham Benslim. "Monitoring corn and soybean agroecosystems after establishing no-tillage practices in Québec, Canada." Canadian Journal of Plant Science 87, no. 4 (October 1, 2007): 841–49. http://dx.doi.org/10.4141/cjps06023.
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The conversion to no-tillage (NT) may seem risky to some producers who rely on tillage to control weeds, some insect pests and disease-causing pathogens that can reduce crop yield. Weeds, arthropods, and disease incidence were monitored in silage corn (Zea mays L.) and soybean (Glycine max L. Merr.) agroecosystems with CT and newly established NT plots in Ste-Anne-de-Bellevue, Québec. During the first 2 establishment years, there were more annual grass and fewer annual broadleaf weeds in NT than in CT plots, but the surface area covered by weeds (broadleaf,grasses and perennials) was greater in CT than NT plots. Foliar arthropods were more numerous in soybean than corn plots in both years, but were unaffected by tillage. There were more ground-dwelling generalist predators, especially Coleoptera and Carabidae, in CT than NT plots, while spiders and harvestmen (Araneae and Opiliones) were dominant in NT plots. Crop damage from insect pests and diseases was below economic thresholds, but 5 yr of yield monitoring (2000–2004) revealed a trend of greater silage corn and soybean yields in CT than NT plots. The reduction in crop yield after establishing NT practices at this site was probably due to rooting constraints from inadequate seedbed preparation in the NT system, rather than from weed competition, insect damage or crop diseases. Key words: Arthropods, crop disease, silage corn, soybean, tillage, weed control
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Gu, Yili, Zhiqiang Li, Zhen Zhang, Jun Li, and Liqing Chen. "Path Tracking Control of Field Information-Collecting Robot Based on Improved Convolutional Neural Network Algorithm." Sensors 20, no. 3 (January 31, 2020): 797. http://dx.doi.org/10.3390/s20030797.
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Due to the narrow row spacing of corn, the lack of light in the field caused by the blocking of branches, leaves and weeds in the middle and late stages of corn growth, it is generally difficult for machinery to move between rows and also impossible to observe the corn growth in real time. To solve the problem, a robot for corn interlines information collection thus is designed. First, the mathematical model of the robot is established using the designed control system. Second, an improved convolutional neural network model is proposed for training and learning, and the driving path is fitted by detecting and identifying corn rhizomes. Next, a multi-body dynamics simulation software, RecurDyn/track, is used to establish a dynamic model of the robot movement in soft soil conditions, and a control system is developed in MATLAB/SIMULINK for joint simulation experiments. Simulation results show that the method for controlling a sliding-mode variable structure can achieve better control results. Finally, experiments on the ground and in a simulated field environment show that the robot for field information collection based on the method developed runs stably and shows little deviation. The robot can be well applied for field plant protection, the control of corn diseases and insect pests, and the realization of human–machine separation.
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Windasari, Lily, Meitini Wahyuni Proborini, and Made Ria Defiani. "BIOKONTROL ENDOMIKORIZA TERHADAP JAMUR Curvularia sp. PENYEBAB PENYAKIT TANAMAN JAGUNG (Zea mays L.)." SIMBIOSIS 7, no. 2 (September 30, 2019): 28. http://dx.doi.org/10.24843/jsimbiosis.2019.v07.i02.p03.
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In Indonesia, production of corn are used for fodder (55%), food (30%), and seed (15%). The growth of corn plants is limited by the presence of pests, weeds, and plant diseases. Curvularia sp. causing leaf spot and could decrease corn production. Use of mycorrhiza can be used as a biological agent in preventing pathogens outbreaks. Isolates of Curvularia sp. fungal was sprayed on corn seed. This research was conducted in laboratorium and green house. Corn seedlings were grown on sterile soil media (control), mycorrhizal treatments (100g of mycorrhizal + Curvularia sp., 200g of mycorrhizal + Curvularia sp., 300g of mycorrhizal + Curvularia sp.) and Curvularia sp. The observed variables were plant height, number of leaves, rate of disease progression, fresh weight and dry weight of plant canopy. The results showed that application of 100g inoculum tend to increase plant growth to 26-27% and percentage of mycorrhizal colonization to 58,66% thereof can decrease pathogen infection on plant at 28 day after planting.
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Jones, Tara-kay L., and Raul F. Medina. "Corn Stunt Disease: An Ideal Insect–Microbial–Plant Pathosystem for Comprehensive Studies of Vector-Borne Plant Diseases of Corn." Plants 9, no. 6 (June 14, 2020): 747. http://dx.doi.org/10.3390/plants9060747.
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Over 700 plant diseases identified as vector-borne negatively impact plant health and food security globally. The pest control of vector-borne diseases in agricultural settings is in urgent need of more effective tools. Ongoing research in genetics, molecular biology, physiology, and vector behavior has begun to unravel new insights into the transmission of phytopathogens by their insect vectors. However, the intricate mechanisms involved in phytopathogen transmission for certain pathosystems warrant further investigation. In this review, we propose the corn stunt pathosystem (Zea mays–Spiroplasma kunkelii–Dalbulus maidis) as an ideal model for dissecting the molecular determinants and mechanisms underpinning the persistent transmission of a mollicute by its specialist insect vector to an economically important monocotyledonous crop. Corn stunt is the most important disease of corn in the Americas and the Caribbean, where it causes the severe stunting of corn plants and can result in up to 100% yield loss. A comprehensive study of the corn stunt disease system will pave the way for the discovery of novel molecular targets for genetic pest control targeting either the insect vector or the phytopathogen.
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Vitanza, Salvador, Celeste Welty, Mark Bennett, Sally Miller, and Richard Derksen. "(27) Effect of Plant Stand Density and Pesticide Application Technology on Insect Pests and Diseases of Bell Peppers." HortScience 41, no. 4 (July 2006): 1075B—1075. http://dx.doi.org/10.21273/hortsci.41.4.1075b.
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The impact of pesticide application technology and crop stand density on bell pepper production was evaluated in a series of field trials, during 2004 and 2005, at the North Central Agricultural Research Station, Fremont, Ohio. In 2004, one trial tested three sprayers, at a speed of 8 and 4 mph, using insecticides at half the recommended rate and one treatment at full rate. Sprayers evaluated included an air-assisted electrostatic sprayer, a Cagle sprayer equipped with AI-11005 or AI-110025 nozzles, and an air-blast sprayer with XR-1003-VS or XR-110015-VS nozzles. In 2005, one experiment tested the interaction of two application technologies, three planting distances within row, and single vs. twin rows. Another experiment compared the Cagle sprayer (with TJ60-11003 or AI-110025 nozzles) and the airblast sprayer (with XR-110015-VS nozzles), at a speed of 4 mph, and insecticides at half the recommended rate. In 2004, the Cagle sprayer with air-induction nozzle, half rate, at 8 mph obtained the highest fruit yield. There was not significant improvement in European corn borer control by applying insecticides at full rate with the Cagle sprayer and all treatments achieved significantly better bacterial soft rot control than the untreated control. In 2005, the trials were terminated early due to crop destruction by Phytophthora capsici. Red fruit weighed less at high than at medium or low plant stand densities. Clean yield of red fruit was significantly greater in single rows than in twin rows. Marketable yield of green fruit was greater using the TJ60-11003 than using the AI-110025 nozzles.
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Farias-Larios, J., and A. Michel-Rosales. "Sustainable Production of Honeydew and Muskmelon in Western Mexico." HortScience 33, no. 3 (June 1998): 495d—495. http://dx.doi.org/10.21273/hortsci.33.3.495d.
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In Western Mexico, melon production depends on high-input systems to maximize yield and product quality. Tillage, plasticulture, fumigation with methyl bromide, and fertigation, are the principal management practices in these systems. However, at present several problems has been found: pests as sweetpotato whitefly (Bemisia tabaci Gennadius), aphids (Myzus and Aphis), leafminer (Liryomiza sativae); diseases as Fusarium, Verticilium, and Pseudoperenospora, and weeds demand high pesticide utilization and labor. There is a growing demand for alternative cultural practices, with an emphasis on reducing off-farm input labor and chemicals. Our research is based on use of organic mulches, such as: rice straw, mature maize leaves, banana leaves, sugarcane bagasse, coconut leaves, and living mulches with annual legume cover crop in melons with crop rotation, such as: Canavalia, Stilozobium, Crotalaria, and Clitoria species. Also, inoculations with mycorrhizal arbuscular fungi for honeydew and cantaloupe melon seedlings production are been assayed in greenhouse conditions for a transplant system. The use of life barriers with sorghum, marigold, and other aromatic native plants in conjunction with a colored yellow systems traps for monitoring pests is being studied as well. While that the pest control is based in commercial formulations of Beauveria bassiana for biological control. The first results of this research show that the Glomus intraradices, G. fasciculatum, G. etunicatum, and G. mosseae reached 38.5%, 33.5%, 27.0%, and 31.0% of root infection levels, respectively. Honeydew melons production with rice and corn straw mulches shows an beneficial effect with 113.30 and 111.20 kg/plot of 10 m2 compared with bare soil with 100.20 kg. The proposed system likely also lowers production cost and is applicable to small- and large-scale melon production.
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Johnson, W. Carroll, Albert K. Culbreath, and Xuelin Luo. "Interactive Effects of Cultivation, Insect Control, and Fungal Disease Control in Organic Peanut Production." Peanut Science 45, no. 1 (January 1, 2018): 38–44. http://dx.doi.org/10.3146/ps17-14.1.
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ABSTRACT During previous organic peanut weed management trials, maintenance pesticides were not applied and it was observed that insect infestations and disease epidemics were not problematic. This was surprising considering that conventional peanut are routinely treated with insecticides and fungicides to control common pests. It was hypothesized that components of the organic peanut production system could be integrated into conventional peanut production to reduce inputs. Structured research trials were conducted from 2012 through 2014 to determine interactions among three levels of weed control, two levels of insect control, and three levels of fungal disease control in organic peanut production using a factorial arrangement of treatments. Weed control treatments were weed-free using handweeding, cultivation with a tine weeder repeated weekly for six weeks, and a non-cultivated (weedy) control. Insect control treatments were two early-season applications of spinosad (Organic Materials Review Institute approved) and a nontreated control. Fungal disease control treatments were applications of cupric oxide plus sulfur (Cu+S) at three-week intervals, the conventional fungicide azoxystrobin at three-week intervals, and a nontreated control. The peanut cultivar Georgia-04S was planted each year of the study. The crop rotation at the research sites was corn grown in alternating years between peanut experiments. There were no interactions among the main effects. Compared to the non-cultivated control, cultivation with a tine weeder consistently reduced weed densities, and yields were equivalent to handweeded peanut two years of three. Intensive cultivation with a tine weeder did not increase disease epidemics or reduce peanut yield, which is contradictory to long-standing peanut production recommendations. Spinosad applications did not affect any of the parameters measured, including incidence of thrips-vectored spotted wilt and peanut yield. Cupric oxide plus sulfur controlled peanut diseases equal to azoxystrobin two years out of three, but peanut yields did not consistently respond to improved disease control from the conventional fungicide. We speculate that ideal crop rotations to reduce disease inoculum and modern peanut cultivars with improved disease tolerance are also factors that allow the use of reduced pest control inputs.
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Wen, Sheng, Quanyong Zhang, Jizhong Deng, Yubin Lan, Xuanchun Yin, and Jian Shan. "Design and Experiment of a Variable Spray System for Unmanned Aerial Vehicles Based on PID and PWM Control." Applied Sciences 8, no. 12 (December 3, 2018): 2482. http://dx.doi.org/10.3390/app8122482.
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Unmanned aerial vehicle (UAV) variable-rate spraying technology, as the development direction of aviation for plant protection in the future, has been developed rapidly in recent years. In the actual agricultural production, the severity of plant diseases and insect pests varies in different locations. In order to reduce the waste of pesticides, pesticides should be applied according to the severity of pests, insects and weeds. On the basis of explaining the plant diseases and insect pests map in the target area, a pulse width modulation variable spray system is designed. Moreover, the STMicroelectronics-32 (STM32) chip is invoked as the core of the control system. The system combines with sensor technology to get the prescription value through real-time interpretation of prescription diagram in operation. Then, a pulse square wave with variable duty cycles is generated to adjust the flow rate. A closed-loop Proportional-Integral-Derivative (PID) control algorithm is used to shorten the time of system reaching steady state. The results indicate that the deviation between volume and target traffic is stable, which is within 2.16%. When the duty cycle of the square wave is within the range of 40% to 100%, the flow range of the single nozzle varies from 0.16 L/min to 0.54 L/min. Variable spray operation under different spray requirements is achieved. The outdoor tests of variable spray system show that the variable spray system can adjust the flow rapidly according to the prescription value set in the prescription map. The proportion of actual droplet deposition and deposition density in the operation unit is consistent with the prescription value, which proves the effectiveness of the designed variable spray system.
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Liu, Yu, Xiaoping Wang, and Jiaxin Qian. "Crop distribution extraction based on Sentinel data." E3S Web of Conferences 252 (2021): 02081. http://dx.doi.org/10.1051/e3sconf/202125202081.
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Remote sensing identification and classification of crops is the use of remote sensing for estimating crop planting area of timely and accurate monitoring of crop growth and plant diseases and insect pests in advance to make the product output to estimate the key and premise of the study using Sentinel-1 and Sentinel-2 satellite, by random forest algorithm, the traditional optical wavelengths and vegetation index The backward scattering field of red edge information and radar information in feature selection and feature classification, including winter wheat summer corn orchard woodland town water and bare land set three controls, such as the first group contains radar time characteristics, the characteristics of the second control group contains red edge long, the third group includes traditional vegetation index for phase characteristics, analyzed the different classification accuracy. The results from the confusion matrix show that the red edge band edge after index and the radar scattering information to join the crop classification accuracy is improved effectively. Sentinel optical and radar satellites with a time resolution of 5–6 days have great potential for crop monitoring research.
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Astuti, Ludji Pantja, and Mutala’liah Mutala’liah. "Host preference of Tribolium castaneum (Herbst) on six kinds of flour." Jurnal Entomologi Indonesia 17, no. 3 (December 11, 2020): 149. http://dx.doi.org/10.5994/jei.17.3.149.
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<p>The red flour beetle, <em>Tribolium castaneum </em>(Herbts)<em> </em>is a major pest of flour from various grains. The infested flour is discoloured and will emit a disagreeable odour due to the secretion of benzoquinone from the insect’s abdominal glands. Considering the economic losses effected by <em>T. castaneum, </em>new alternative control measures are needed for this pest. This study sought to determine the host preferences of <em>T. castaneum </em>from amongst six kinds of flour to assess their vulnerability to infestation. The research was conducted in the Plant Pest Laboratory, Department of Plant Pests and Diseases, Faculty of Agriculture, University of Brawijaya. The host preferences of <em>T. castaneum</em> were examined using a six-arm olfactometer. Feeding preference tests were performed for a duration of 12 hours at 200 ml/minute airflow in each chamber-arm, followed by oviposition preference observations one week later. Feeding preference was calculated for the total pool of adults observed, segregated by sex, whereas oviposition preference was calculated as the number of eggs laid. Flour nutrition (proximate composition, phenolic content, and riboflavin content) were analyzed. Our results showed a feeding preference by <em>T. castaneum </em>for bran, soy and tapioca flour was greater over wheat, corn, and white gelatinous rice flour, while for oviposition, bran flour was the most preferred.</p>
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Yanti, Yulmira, Munzir Busniah, Trimurti Habazar, Zulfadli Syarief, and Intan Sari Pasaribu. "PENGEMBANGAN PERTANIAN ORGANIK MELALUI BUDIDAYA TANAMAN PALAWIJA DENGAN APLIKASI TEKNOLOGI RIZOBAKTERI INDIGENOS DI NAGARI SUNGAI DURIAN KABUPATEN SOLOK." LOGISTA - Jurnal Ilmiah Pengabdian kepada Masyarakat 1, no. 2 (December 15, 2017): 88. http://dx.doi.org/10.25077/logista.1.2.88-94.2017.
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ABSTRAK
Nagari Sungai Durian Kabupaten Solok merupakan salah satu nagari yang memiliki berbagai permasalahan seperti kekeringan, tingginya jumlah lahan tidur dan jauhnya akses. Tanaman utama yang ditanam saat musim hujan adalah padi sawah, namun sebagian besar lahan menjadi lahan tidur saat musim kemarau. Solusi yang dapat ditawarkan adalah dengan penanaman tanaman palawija yang lebih tahan terhadap kekeringan dan penggunaan rizobakteri sebagai agens pengendali hama dan penyakit. Selain sebagai agens pengendali hama dan penyakit, penggunaan rizobakteri juga sebagai PGPR (Plant Growth Promoting Rhizobacteria) yang mampu meningkatkan pertumbuhan dan hasil tanaman. Tujuan dari program pengabdian masyarakat ini adalah memberikan pengetahuan kepada masyarakat dalam budidaya tanaman palawija dengan aplikasi teknologi rizobakteri indigenos. Kegiatan ini dilakukan dengan cara sosialisasi dan demonstrasi plot. Adapun luaran yang didapat dari program pengabdian masyarakat ini adalah :1) Masyarakat mendapatkan pengetahuan serta menguasai teknik budidaya tanaman palawija yang baik (jagung, singkong dan ubi jalar); 2) pengetahuan mengenai teknologi pemanfaatan rizobakteri sebagai agens hayati dalam pengendalian hama dan penyakit tanaman serta peningkatan pertumbuhan dan hasil tanaman palawija; 3) Mendapatkan produk pertanian organik (jagung, singkong dan ubi jalar) yang bebas dari penggunaan pupuk dan pestisida sintetik.
Kata kunci : Agens hayati, Rizobakteri, PGPR, Tanaman palawija
ABSTRACT
Nagari Sungai Durian of Solok District is one of the village that has various problems such as drought, high number of unused land and the distance of urban access. The main crops in this village grown during the rainy season are wetland paddy, but most of the land becomes unused during the dry season. The solution that can be offered is by planting crops that are more resistant to drought and the use of rhizobacteria as pest and disease control agents. In addition to pest and disease control agents, the use of rhizobacteria which also called PGPR (Plant Growth Promoting Rhizobacteria) that can increase growth and yield of plants. The purpose of this community service program is to provide knowledge to the community in the cultivation of secondary crops with the application of indigenous rhizobacteria technology. This activity is done by socialization and demonstration plot. The outcomes obtained from this community service program are: 1) Communities gain knowledge and master good cultivation of secondary crops (corn, cassava and sweet potatoes); 2) knowledge of rhizobacteria utilization technology as biological agent in plant pests and diseases control and improvement of crops' growth and yield; 3) Obtain organic agricultural products (corn, cassava and sweet potato) that are free from the use of synthetic fertilizers and pesticides.
Keywords: Biological agents, Rhizobacteria, PGPR, Secondary crops
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Krizek, Donald, Patricia Millner, Mary Camp, David Clark, Mark Davis, Bryan Butler, John Teasdale, et al. "(412) Tomato Diseases." HortScience 40, no. 4 (July 2005): 1071A—1071. http://dx.doi.org/10.21273/hortsci.40.4.1071a.
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Afield study of organic production of tomato (Lycopersiconesculentum Mill.) in high-tunnels was conducted in 2004. `Mountain Fresh' was transplanted 31 Mar.; `Ultra Sweet' and `Sun Leaper' were transplanted on 21 July. The primary objective was to determine the feasibility of obtaining two crops of fresh-market tomatoes by starting plants 4–8 weeks earlier than the average last spring-killing frost, and extending the growing season 4–6 weeks past the average first fall-killing frost. Plants were started at weekly intervals for 4 weeks in both seasons. Data and observations were recorded on the yield of marketable fruits, plant growth and development, and plant health. Other objectives were to evaluate: 1) the benefits of using a selective UV-blocking film on plant growth and development, disease events; and 2) compost amendments on soil improvement and disease control. Major cultural challenges included water management, soil texture/drainage, prevention of chilling injury, plant support, and adequate ventilation. Major disease/pest challenges involved stalk rot caused by Sclerotinia sclerotiorum in the spring, powdery mildew in spring and late summer, Alternaria and Septoria leaf blight in late summer, and aphids, tomato hornworm, corn earworm, and beet army worm also in late summer. In addition, macrofaunal intrusions by fox, mice, and birds occurred sporadically. Poor drainage and stalk rot in the spring necessitated relocating the tunnels to an uninfested site with better drainage. The fall crop yielded high numbers of marketable quality fruits, well beyond the 15 Oct. average killing frost date. The results suggest that with improved management, there is a considerable potential for profitable extended-season production of organic tomatoes in this region.
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Gao, Gary. "382 The Southwest Ohio Fruit and Vegetable School—A Successful Multi-county Program." HortScience 35, no. 3 (June 2000): 458D—458. http://dx.doi.org/10.21273/hortsci.35.3.458d.
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Southwest Ohio Fruit and Vegetable School is a regional training program for both commercial growers and amateur gardeners. The program has been sponsored by four county Extension offices in Southwest Ohio and has attracted a total attendance of 571 since 1995. We have offered two concurrent sessions, one for commercial fruit and vegetable growers, and one for amateur gardeners. This combination has proven to be the key factor in the success of the program. Attendees are allowed to move between the commercial and amateur sessions. Many commercial growers brought their spouses along since there were good topics for both of them. Backyard gardeners benefitted from the commercial session since the information was very applicable to their situation. Commercial growers also receive their pesticide recertification credits. Some of the popular topics for the commercial session included: management of diseases, insects, and weeds of fruits and vegetables; production of fresh market tomatoes, green beans, peppers, sweet corn, and pumpkins; production of herbs and specialty crops; production of apples, raspberries, strawberries, and blueberries. Popular topics for the non-commercial session included: growing tree fruits and small fruits in home gardens; raised bed gardening; growing giant pumpkins; nuisance wildlife damage control; growing and using culinary herbs; beneficial insects; and managing garden pests without using conventional insecticides. The Southwest Ohio Fruit and Vegetable School has been a very successful training program and could serve as a good model for other county Extension educators.
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Peros, Iván Gabriel, Carolina Susana Cerrudo, Marcela Gabriela Pilloff, Mariano Nicolás Belaich, Mario Enrique Lozano, and Pablo Daniel Ghiringhelli. "Advances in the Bioinformatics Knowledge of mRNA Polyadenylation in Baculovirus Genes." Viruses 12, no. 12 (December 6, 2020): 1395. http://dx.doi.org/10.3390/v12121395.
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Baculoviruses are a group of insect viruses with large circular dsDNA genomes exploited in numerous biotechnological applications, such as the biological control of agricultural pests, the expression of recombinant proteins or the gene delivery of therapeutic sequences in mammals, among others. Their genomes encode between 80 and 200 proteins, of which 38 are shared by all reported species. Thanks to multi-omic studies, there is remarkable information about the baculoviral proteome and the temporality in the virus gene expression. This allows some functional elements of the genome to be very well described, such as promoters and open reading frames. However, less information is available about the transcription termination signals and, consequently, there are still imprecisions about what are the limits of the transcriptional units present in the baculovirus genomes and how is the processing of the 3′ end of viral mRNA. Regarding to this, in this review we provide an update about the characteristics of DNA signals involved in this process and we contribute to their correct prediction through an exhaustive analysis that involves bibliography information, data mining, RNA structure and a comprehensive study of the core gene 3′ ends from 180 baculovirus genomes.
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Istiqomah, Istiqomah, Ana Amiroh, Dwi Choiriyah, and Suharso Suharso. "KAJIAN MACAM JARAK TANAM SISTEM JAJAR LEGOWO DAN VARIETAS TERHADAP PERTUMBUHAN DAN PRODUKSI TANAMAN PADI (Oryza Sativa L.)." AGRORADIX : Jurnal Ilmu Pertanian 3, no. 1 (December 26, 2019): 29–37. http://dx.doi.org/10.52166/agroteknologi.v3i1.1708.
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Rice is a rice-producing food crop which now plays an important role in economic life in Indonesia. Namely rice as a staple food is very difficult to replace by other staples. Among them are corn, tubers, sago and other carbohydrate sources. So that the existence of rice is now a top priority for the community in meeting the needs of carbohydrate intake that can be filling and is a source of primary carbohydrates that are easily replaced into an energy source. Rice as a staple food is consumed by approximately 90% of the total population in Indonesia for daily essential food (Saragih,2001). How to plant with the jajar legowo system has the advantage that the plants are on the edge so that optimal sunshine can cause plant productivity to be high, facilitate weed control and pests / diseases, use of fertilizer more effectively and the availability of empty space for regulating water channel circulation on land (Sirrapa, 2011). This research was conducted using Factorial Randomized Block Design (RBD) method, which consisted of two factors and each factor consisting of 3 levels repeated 3 times, namely: J1: Conventional,J2: Jajar Legowo 2: 1,J3: Jajar Legowo 4: 1. Factor II: Varieties with 3 levels, V1: Situ Bagendit, V2: Ciherang,V3: IR-64. Of the two factors 9 combinations of treatments were obtained and repeated 3 times. Data obtained from observations were calculated by analysis of variance with the Fisher test (-F test at the level of 5% and 1%), if there were significant differences, it would be followed by the Smallest Significant Difference test (LSD 5%). The treatment of the legowo 4: 1 row system and the ciherang variety (V2J3) produces a better value than other treatments.
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Douangboupha, Bounneuang, Tasanee Jamjanya, Nutcharee Siri, and Yupa Hanboonsong. "Sweet Corn Insect Pests and their Control." Khon Kaen University Journal (Graduate Studies) 06, no. 3 (July 1, 2007): 25–37. http://dx.doi.org/10.5481/kkujgs.2006.06.3.3.
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Chamberlin, Kelly D., and Naveen Puppala. "Genotyping of the Valencia Peanut Core Collection with a Molecular Marker Associated with Sclerotinia blight Resistance." Peanut Science 45, no. 1 (January 1, 2018): 12–18. http://dx.doi.org/10.3146/ps17-15.1.
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ABSTRACT Cultivated peanut, the second most economically important legume crop throughout the United States and the third most important oilseed in the world, is consistently threatened by various diseases and pests. Sclerotinia blight, (causal agents Sclerotinia sclerotiorum (S. sclerotiorum) and Sclerotinia minor Jagger (S. minor))is a major threat to peanut production in the Southwestern U.S., Virginia, and North Carolina and can reduce yield by up to 50% in severely infested fields. S. sclerotiorum has now been reported in areas of eastern New Mexico and west Texas where all U.S. grown Valencia peanuts are produced, commonly in organic cropping environments. Host plant resistance provides the most effective solution to managing Sclerotinia blight, especially in organic systems where pesticide use is not an option for disease control. To date, no Valencia cultivars with Sclerotinia blight resistance have been released. In this study, the Valencia peanut core germplasm collection was genotyped with a Simple Sequence Repeat (SSR) marker associated with Sclerotinia blight resistance in order to identify potential germplasm for use in breeding to develop Valencia peanut cultivars resistant to the disease. Thirty accessions from the Valencia peanut core collection have profiles consistent with other genotypes that exhibit less that 5% incidence of Sclerotinia blight under heavy disease pressure. The identified accessions, after field evaluation, may serve as potential sources of Sclerotinia blight resistance in Valencia peanut breeding programs.
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Marzano, Mariella, Bianca Ambrose-Oji, Clare Hall, and Darren Moseley. "Pests in the City: Managing Public Health Risks and Social Values in Response to Oak Processionary Moth (Thaumetopoea processionea) in the United Kingdom." Forests 11, no. 2 (February 11, 2020): 199. http://dx.doi.org/10.3390/f11020199.
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Oak processionary moth (Thaumetopoea processionea) or OPM was accidentally introduced into London on imported oak trees and now poses a threat to the future of oak in the urban landscape. Early attempts at eradication of the moth failed and significant resources have since been spent by government on monitoring and controlling OPM (through the use of insecticides or bio-pesticides) as it spreads into new areas. OPM is regulated in the UK to minimize risk of new introductions and reduce spread. Surveying for OPM and issuing of statutory notices for control is based on a geographical system of core, control and protected zones. While OPM will defoliate the trees leaving them vulnerable to other pests and diseases and stress factors, the caterpillars can also harm people and animals via tiny urticating hairs with the potential for dermatological or respiratory impacts. However, the biggest threat to the iconic British oak may be that the perceived risks associated with OPM, and costs of management may lead land managers to fell their oak trees, and not plant oak in the future. There is a need to better understand awareness, risk perceptions and decision-making around OPM management. We use a conceptual framework to explore decision-making and the trade-offs between the social, economic and ecological values associated with oak trees, and assessment of risk related to both the moth and control options. Twenty nine interviews were conducted in two London boroughs and across Greater London and in some surrounding counties covering a range of land types (e.g., parks, school grounds, amenity areas and private gardens) with infested or non-infested oak. We found a lack of evidence of human health impacts from OPM although land managers were concerned about public duty of care and potential reputational damage if they do not manage OPM. To address the challenges of dealing with OPM, land managers were taking a risk-based approach and managing OPM where it posed the highest potential risk to people. Respondents expressed strong emotional attachments to oak but it also has high biodiversity value which can lead to difficult decisions about management options. A risk-based approach moves beyond a ‘one-size-fits-all’ control method and focuses available resources where they are most needed and socially acceptable. An approach that allows for multiple values and perspectives on risk may provide a more sustainable long-term option for OPM management to ensure the future of oak in the city.
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Hashem, Mohamed, Yasser S. Mostafa, Saad Alamri, Ahmed M. Abbas, and Ebrahem M. Eid. "Exploitation of Agro-Industrial Residues for the Formulation of a New Active and Cost Effective Biofungicide to Control the Root Rot of Vegetable Crops." Sustainability 13, no. 16 (August 18, 2021): 9254. http://dx.doi.org/10.3390/su13169254.
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This study aimed to produce an economic and stable biofungicide based on a new effective antagonistic strain (Trichoderma harzianum JF419706) via the exploitation of agro-industrial lignocellulosic residues as carriers for fungal growth to control the root rot diseases of vegetable crops. Trichoderma harzianum JF419706 showed a good resistance to a chemical fungicide with two-fold of the recommended dose. It was able to propagate on corn stovers amended with 20% of date molasses, as a very cheap substrate, up to 2.90 × 1016 CFU/g after 30 days. Formulation of the bioagent on the substrate as a fine powder (FTB) increased the shelf-life up to 8 months with good viability (9.37 × 1011 CFU/g). The bioagent propagated itself in the rhizospheric soil about two-fold of the initial inoculum. Application of the FTB, as a seed treatment, suppressed the root rot disease severity percentage of cucumber, lettuce, and tomato plants to 70.0%, 61.5%, and 53.8%, respectively, from the control. The crop yield increased by 50%, 35%, and 30% in the same order of the three crops. FTB promoted the growth and physiological processes of the plants significantly compared with the control. Our study recommends the application of the FTB as a cost-effective biofungicide and biofertilizer in crop management, singly or as a part of integrated pest management, to ensure the sustainability of green farming and reduce the chemical input in cultural practices.
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Dhena, Emanuel Randy, and Yustina Maria Silvia Wonga Puu. "INVENTARISASI DAN IDENTIFIKASI HAMA DAN PENYAKIT UTAMA TANAMAN JAGUNG (Zea mays L.)." AGRICA 4, no. 2 (July 22, 2020): 155–65. http://dx.doi.org/10.37478/agr.v4i2.461.
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This research was carried out in order to understand the main types of pests and diseases that affect corn, which types are most dominant and to understand the severity of these main diseases in corn. Observation of variables involved the identification of pests and diseases that attacked corn plants, the diversity of these pests and diseases as well as the intensity of the damage caused by these pests and diseases. The results of this research showed that the main type of pest and disease that attacks corn are, among others: seedling flies (Atherigonasp), grasshoppers (Oxyasp), corn stalk drillers (Ostrineafurnacalis) and leaf rust. The most dominant type of pest or disease were grasshoppers (Oxyasp) which attacked plant leaves. The seriousness of an attack by a pest or disease was found to be important in the seedling phase, there are many variations in between species of corn and also developed with the age of the corn. At 12 days after planting, the incidence of insect attack was0.2% and at 33 days and 54 days after planting it was 0.32-0.47%. Whereas for disease, when observed at 33 and 54 days after planting, the average incidence of disease attack was 0.05-0.23%. Also, when observed at 61 days and 75 days, the incidence of attack rose to 0.32-40%.
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Rotasouw, Shiska M., Johanna Taribuka, and Handry R. D. Amanupunyo. "Identifikasi dan Kemampuan Jamur Endofitik Asal Jagung (Zea mays L.) Terhadap Patogen Busuk Pelepah (Rhyzoctonia solani)." JURNAL BUDIDAYA PERTANIAN 16, no. 2 (December 30, 2020): 140–46. http://dx.doi.org/10.30598/jbdp.2020.16.2.140.
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Maize is a cereal crop which is an important source of food because it is the second source of carbohydrates after rice. Maize cultivation is faced with various plant diseases, that can reduce the quantity and quality of crop yield. Plant disease is one of the limiting factors for crop production and seed quality. One of the most harmful maize diseases is blight or midrib rot caused by the soil-borne fungus Rhizoctonia solani. The aim of the study was to obtain endophytic microorganisms in maize and to test the antagonistic ability of these fungi as biological control agents against R. solani. The study took place in January-September 2018 in the field and the Laboratory of Plant Pests and Diseases, Faculty of Agriculture, University of Pattimura. Endophytic fungi isolated from maize plants from the roots, stems and leaves. Samples were cleaned in running water and air-dried. Subsequently, the samples were sterilized using 70% alcohol and immersed in sodium hypochlorite solution for 2 minutes and rinsed with sterile water 3 times. The sterilized roots, stems and leaves of maize were peeled, cut to a size of ±5 mm, split and dried on sterile filter paper. Sterile samples were grown on PDA culture media at four points and incubated at room temperature. Visual identification was carried out with the aid of a microscope on fungi growing on the culture media. The results showed the presence of the endophytic fungi Trichoderma sp., Aspergillus sp., Penicillium sp., Diplodia sp. and Mucor sp. These fungal species showed different inhibitory powers, which included mechanisms for direct parasitizing of pathogens, producing antibiotics and competition for space and nutrients.
Keywords: antagonism, corn, endophytic fungi, identification, pathogenic fungus, Rhizoctonia solani
ABSTRAK
Jagung (Zea mays L.) merupakan tanaman serelia yang termasuk bahan pangan penting karena merupakan sumber karbohidrat kedua setelah beras. Salah satu kendala dalam budidaya tanama jagung adalah penurunan produksi akibat serangan patogen penyebab penyakit. Untuk menekan perkembangan penyakit dilakukan pengendalian dengan menggunakan mikroorganisme endofitik asal akar, batang dan daun jagung sebagai agensia pengendalian hayati. Penelitian ini bertujuan mengisolasi dan mengidentifikasi mikroorganisme endofitik asal jagung secara morfologi, mendapatkan mikroorganisme endofitik yang memiliki kemampuan antagonis terhadap jamur Rhizoctonia solani penyebab penyakit busuk pelepah pada jagung. Penelitian berlangsung dalam 2 tahap, yaitu di lapangan dan di Laboratorium Hama dan Penyakit Tumbuhan Fakultas Pertanian, Universitas Pattimura. Sampel tanaman diperoleh dari beberapa kebun petani di wilayah Kota Ambon. Hasil penelitian yang diperoleh adalah bahwa jamur endofitik Trichoderma sp, Aspergillus sp, Penicillium sp, Diplodia sp dan Mucor sp. memiliki daya penghambatan yang berbeda-beda, yaitu 78.57% (Trichoderma sp), 65.86% (Penicillium sp), 43.29% (Aspergillus sp), 36.71 (Diplodia sp) dan 34.44% (Mucor sp).
Kata kunci: antagonisme, identifikasi, jagung, jamur endofitik, jamurpatogenik, Rhizoctonia solani
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Keresi, Tatjana, Radosav Sekulic, Stevan Masirevic, Gordana Forgic, and Vlada Maric. "Control of some sunflower pests by seed treatment." Pesticidi 18, no. 1 (2003): 43–50. http://dx.doi.org/10.2298/pif0301043k.
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During 2000 and 2002, several assays were carried out to study efficacy of insecticide treatment of sunflower seeds against soil pests (larvae of the Elateridae and Scarabaeidae families) and the corn weevil (Tanymecus dilaticollis Gyll). Used in the trials were the following insecticides thiamethoxam, thiamethoxam + tefluthrin, carboturan, fipronil and imidacloprid, and in first year granulated forat and liquid carbosulfan lindan. The parameters for evaluation of insecticides efficacy were stand density and the percentage of plants damaged by corn weevil. Majority of tested insecticides provided significantly higher stand density in relation to untreated control, so that can be used for dressing of sunflower seeds against soil pests under modest to middle populations. The most prospective are thiamethoxam, imidacloprid and carbofuran, that contain systemic properties and can protect young plants from pests of the above ground during early spring.
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Ismailov, Vladimir. "System of biological protection of corn against pests for organic farming." E3S Web of Conferences 285 (2021): 03011. http://dx.doi.org/10.1051/e3sconf/202128503011.
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This study discusses promising methods of biological control of the main corn pests, based on the integrated use of pheromones, entomopathogenic preparations and the release of parasitic hymenoptera Trichogramma evanescens West. and Habrobracon hebetor Say. Seasonal dynamics of flying and the number of cotton moth Helicoverpa armigera Hbn. and Kuban click beetle Agriotes tauricus Heyd. were determined by capturing males with pheromone traps. Species composition of corn pests, the dynamics of flying and the number of dominant pests of the cotton moth H. armigera and corn moth Os. nubilalis are determined, the optimal dates for protective measures (release of entomophages - Trichogramma and Habrobracon, treatment with biological products) are set. As a result of the field assessment of the biological control system of the main corn pests, we determined the satisfactory efficacy of the mutually suppressing techniques based on using Trichogramma and Habrobracon entomophages and biological preparations based on entomopathogenic bacteria and viruses. The corn bioprotection efficacy against the stem corn moth was 84 % in the early hybrid and 94 % in the late one, against the cotton moth – 82,2 - 77,8 %, respectively.
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Regan, Karly H., Christina A. Voortman, John M. Wallace, and Mary E. Barbercheck. "Prevalence of Early- and Late-Season Pest Damage to Corn in Cover Crop-Based Reduced-Tillage Organic Systems." Environmental Entomology 49, no. 4 (June 22, 2020): 865–75. http://dx.doi.org/10.1093/ee/nvaa071.
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Abstract In organic agronomic cropping systems, the use of synthetic insecticides and transgenic varieties are prohibited and producers rely mainly on biological control, tillage, crop rotation, and other cultural practices to manage pests. We measured damage to organic corn (Zea mays L.) from multiple invertebrate pests, including slugs (Gastropoda: Mollusca), European corn borer (Ostrinia nubilalis Hübner), corn earworm (Helicoverpa zea Boddie), and fall armyworm (Spodoptera frugiperda Smith), early and late in the growing season in four cropping systems that varied in tillage frequency and intensity and in winter cover crop species. Specific management tactics included two cover crop mixtures preceding corn, the use of a roller-crimper or tillage to terminate cover crops preceding corn, and the establishment of interseeded cover crops after corn emergence. Prevalence of early-season damage was high, but severity of damage was very low and unrelated to corn yield. The proportion of corn plants affected by chewing pests early in the season was lower in plots in which tillage compared to a roller-crimper was used to terminate cover crops. Cropping system did not affect the numbers of late-season caterpillar pests or corn yield. Predation by natural enemies appeared to effectively maintain damage from chewing pests below yield-damaging levels. These results support the inclusion of winter and interseeded cover crops in organic agronomic crop rotations to gain environmental benefits without increasing risks of damage by insect pests.
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Sulindawaty, Muhammad Zarlis, Zakarias Situmorang, and Hengki Tamando Sihotang. "Expert System Diagnosis Corn Pests And Diseases Using Certainty Factor Method." Journal of Physics: Conference Series 1230 (July 2019): 012063. http://dx.doi.org/10.1088/1742-6596/1230/1/012063.
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Hoy, Casey W., and Michael J. Dunlap. "Ear-Infesting Insect Control on Sweet Corn, 1997." Arthropod Management Tests 23, no. 1 (January 1, 1998): 95. http://dx.doi.org/10.1093/amt/23.1.95.
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Abstract ‘Seneca Daybreak’ sweet corn was planted 10 Jul on the Fry Farm at the OARDC, Wooster, Ohio. Plant spacing was 30 inches between rows and 6-8 inches between plants. Plots consisted of 2 rows, 50 ft in length, with two untreated guard rows between plots and 3 ft of untreated corn at either end of each plot. Treatments were applied during the silking period on 27 Aug, 1, 4, 8, and 12 Sep using a backpack sprayer delivering 30 gpa at 50 psi with a flat fan nozzle directed at the ear zone. Plots were evaluated 16 Sep by examining 30 ears from the middle two rows of each plot for any lepidopteran pests infesting the ears and for feeding damage to the kernels.
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Hoy, Casey W., and Michael J. Dunlap. "Ear Infesting Insect Control in Sweet Corn, 1995." Arthropod Management Tests 21, no. 1 (January 1, 1996): 110. http://dx.doi.org/10.1093/amt/21.1.110.
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Abstract ‘Early Sunglow’ sweet corn was planted 10 Jul on the Snyder Farm at the OARDC, Wooster, Ohio. Plant spacing was 30 inches between rows and 6-8 inches between plants. Plots consisted of 4 rows, 25 ft in length, with two untreated guard rows between plots and 6 ft of untreated corn at either end of each plot. Treatments were applied during the silking period on 25, 30 Aug, 2, 5, and 9 Sep using a backpack sprayer delivering 30 gal/acre at 50 psi with a flat fan nozzle directed at the ear zone. Plots were evaluated 12 Sep by examining 30 ears from the middle two rows of each plot for any lepidopteran pests infesting the ears and for feeding damage to the kernels.
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Bayu, Marida Santi Yudha Ika, Yusmani Prayogo, and Gatut Wahyu Anggoro Susanto. "INTEGRATED BIOLOGICAL TECHNOLOGY TO CONTROL MUNGBEAN PESTS AND DISEASES." Indonesian Journal of Agricultural Science 22, no. 1 (July 9, 2021): 8. http://dx.doi.org/10.21082/ijas.v22n1.2021.p8-16.
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The main constraints to increase mungbean production in Indonesia are pests and diseases. The application of integrated biological agents can improve the efficacy of controlling the mungbean pests and diseases. The study aimed to determine the efficacy of integrated biological agents to suppress mungbean pests and diseases. This field research was conducted from May to July 2018 using a randomized block design with seven treatments and four replicates. The treatments were: T1 = Trichol + NSP, T2 = Trichol + SlNPV, T3 = Trichol + NSP + SlNPV, T4 = Trichol + NSP + SlNPV + BeBas, T5 = Trichol + NSP + SlNPV + BeBas + GE, T6 = chemical pesticides, and T7 = control. The results showed that the highest efficacy occurred in T4 and T5 treatments which saved the yield loss from major pests and diseases attack, and did not differ significantly with chemical pesticides (T6). Treatments T4 was able to reduce the development of soil borne diseases by 3% and suppress Spodoptera litura attack by 9.8% as compared to chemical treatment. T4 was also more efficient than T5 because it uses less biological agents. The advantage of biological agents is compatible if they were used together with predators such as Oxyopes sp., Paederus sp. and Coccinella sp; and also Telenomus sp. and Trichogramma sp. parasitoids. On the other hand, the chemical pesticides (T6) killed all existing natural enemies. Therefore, T4 could be recommended for controlling mungbean pests and diseases.
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Buntin, G. David, Wayne A. Hanna, Jeffrey P. Wilson, and Xinzhi Ni. "Efficacy of Insecticides for Control of Insect Pests of Pearl Millet for Grain Production." Plant Health Progress 8, no. 1 (January 2007): 26. http://dx.doi.org/10.1094/php-2007-0219-01-rs.
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Pearl millet [Pennisetum glaucum (L.) R. Br.] is an alternative drought-tolerant grain crop for dryland summer production. Few insecticides are registered for use and insect management has not been extensively studied in pearl millet for grain production. Eleven trails were conducted during 2002-2004 in central and southern Georgia to understand the relative importance of insect pests and to evaluate the efficacy of currently registered insecticides against key pests. The main defoliator species were the fall armyworm [Spodoptera frugiperda (J.E. Smith)] and striped grassworm (Mocis latipes Guenée). Main insects feeding on grain heads were the corn earworm (Helicoverpa zea Boddie), sorghum webworm, (Nola sorghiella Riley), and stink bugs — brown stink bug (Euschistus spp.) and southern green stink bug [Nezara viridula (L.)]. All insects were effectively controlled by cypermethrin at 0.025 lb a.i./acre. The 0.015-lb a.i. rate was effective against sorghum webworm, striped grassworm, and stink bugs, but efficacy against the corn earworm was variable. Spinosad was effective against corn earworm, striped grassworm, and sorghum webworm but not against stink bugs. Azadirachtin was not effective against any insect tested. Grain yield was not significantly affected by treatments in any trial indicating that pearl millet is tolerant of insect injury. Further work will be needed to define economic thresholds for key insect pests of pearl millet for grain production. Accepted for publication 24 August 2006. Published 19 February 2007.
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Sumaryanti, Lilik, Teddy Istanto, and Selfina Pare. "Rule Based Method in Expert System for Detection Pests and Diseases of Corn." Journal of Physics: Conference Series 1569 (July 2020): 022023. http://dx.doi.org/10.1088/1742-6596/1569/2/022023.
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Visutsak, Porawat. "Ontology-Based Semantic Retrieval for Durian Pests and Diseases Control System." International Journal of Machine Learning and Computing 11, no. 1 (January 2021): 92–97. http://dx.doi.org/10.18178/ijmlc.2021.11.1.1019.
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In Southeast Asia, durian is affectionately called the king of fruit. Durian is the most popular crop planted in eastern and southern of Thailand. The total crop is around 600,000 tons per year; among this, 500,000 tons of the total production were exported worldwide. In Thailand, the knowledge of durian production is based on experience from generation to generation, especially the knowledge of durian pests and diseases control. This paper presents the ontology knowledge based for durian pests and diseases retrieval system. The major contributions of the system consist of 1) the stored knowledge of durian pests and diseases and 2) the diagnosis of durian diseases and the suggestions for the treatments. The ontology knowledge consists of 8 main classes: 1) diseases, 2) pests, 3) cultivars, 4) symptoms of bunch, 5) leaf area symptoms, 6) symptoms of the branches and trunk, 7) symptoms of fruit, and 8) symptoms of root and growth. The experimental results yielded 100% of precision, 88.33% of recall, and 93.8% of overall performance.
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Wada, Akaamaa C. "Some Important Diseases and Pests of Sugarcane in Nigeria and Their Control." Outlook on Agriculture 26, no. 2 (June 1997): 101–5. http://dx.doi.org/10.1177/003072709702600207.
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Sugarcane smut (Ustilagoscitaminea), red rot (Glomerellatucumanensis), sugarcane leaf blast (Paraphaeosphaeriamichotil). sugarcane mosaic virus (SCMV) and Curvularia leaf spot are the prevalent diseases of sugarcane in Nigeria today. Sugarcane pests of economic importance include the stemborers, termites and nematodes. These diseases and pests can be managed by cultural and chemical methods pending the development of resistant varieties. The problems caused to sugarcane growers in some states of Nigeria by these diseases and pests, and some palliative measures which are used to contain them, are discussed.
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Du, Fang, Bernard J. Morzuch, L. Joe Moffitt, and Prasanta C. Bhowmik. "Statistical analysis of pesttolerant crop response with reference to corn weed control." American Journal of Alternative Agriculture 15, no. 3 (September 2000): 137–41. http://dx.doi.org/10.1017/s0889189300008651.
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AbstractA statistical model of crop-weed competition is developed to permit, but not require, the existence of crop tolerance of weed pests. The popular rectangular hyperbolic model of crop-weed competition is shown to be a special case of the more comprehensive model. Application of the model to corn weed control in Massachusetts demonstrates its practicality and detects evidence of pest-tolerant crop response in this crop-weed system.
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Bhandari, Devashish, Rupak Karn, Bipin Neupane, and Dinesh Marasini. "A review on corn breeding for insect pest resistance." International Journal of Agricultural Invention 4, no. 02 (November 15, 2019): 126–29. http://dx.doi.org/10.46492/ijai/2019.4.2.1.
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Significant yield reduction and effect on almost every aspect of the plants by insect pests have been a mega problem in agricultural crops. Scientist tackle with many challenges to develop highly efficient techniques either through conventional breeding or modern genetic engineering to understand the mechanism of resistance and its application for benefit of human kind. Antibiosis, antixenosis and tolerance are the resistance mechanisms which have been developed for successful control of economically important insect pests in corn. Plant morphology and allelochemicals, induced resistance, callus tissue culture and genetic transformation were used as major tools to advance resistance by corn breeders. Insect pest resistant corn has been attributed for social, economical as well as environmental benefits. However, outcome of these achievements are not reflected due to low use of insect resistant corn by farmers in many developing countries of the world.
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Cook, Rosalind, Anne Carter, Pamela Westgate, and Ruth Hazzard. "Optimum Timing of an Application of Corn Oil and Bacillus thuringiensis to Control Lepidopteran Pests in Sweet Corn." HortTechnology 14, no. 3 (January 2004): 307–14. http://dx.doi.org/10.21273/horttech.14.3.0307.
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Corn oil and Bacillus thuringiensis ssp. kurstaki (Bt) applied directly into the silk channel of a corn ear has been shown to be an effective pesticide against corn earworm, Helicoverpa zea (CEW), and european corn borer, Ostrinia nubilalis (ECB). Field studies were conducted in 2000 and 2001 to determine the influence of application timing on ear quality at harvest. Two blocks of corn were planted during each year to observe treatment effects under varying populations of the two insect species. The treatment consisted of 0.5 mL (0.017 floz) of food grade corn oil containing a suspension of Bt at 0.08 g (0.003 oz) a.i. per ear applied directly into the silk channel at the husk opening. One treatment application was made on each silk day 3 through 11 from first silk; silk day 1 was the first day that 50% or more of ears had 2.5 cm (1 inch) of silk protruding from the husk. One treatment did not receive the oil + Bt suspension. All ears were harvested at milk stage, on silk day 25. The number of CEW larvae in treated ears increased with later application days in 2000, but not in 2001. Damage from larval feeding was mainly found near the tip of the ear, and damage ratings were lower compared to untreated ears for all treatment days for both plantings in 2000, and through application day 8 in the late planting of 2001. ECB larvae were reduced for all treatment days in both plantings in 2000 and the late planting of 2001. The percentage of ears rated as marketable (i.e., free of feeding damage) ranged from 71% to 100% in treated plots compared to 30% to 77% in the untreated plots. There was a linear decrease in marketability with later application days in two of the four plantings. The greatest decrease in marketability was after application day 7. Because the oil application affects kernel development at the tip, the length of ear with under-developed kernels, or cone tip, was measured. The number of ears with cone tip decreased linearly with the later application days in all plantings. There was 10% conetip or less after day 7 in 2000 and day 6 in 2001. The best combination of effective insect control resulting in the highest rates of marketable ears with the least degree of cone tip was achieved in this experiment by application of oil + Bt suspension on day 7. Year to year variation in the environment would suggest a range from day 6 to 8.
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Herman, M. "Sebelas Tahun Perkembangan Jagung Bt dan Statusnya secara Global." Jurnal AgroBiogen 3, no. 2 (August 9, 2016): 73. http://dx.doi.org/10.21082/jbio.v3n2.2007.p73-79.
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<p>Major insect pests of corn are the Asian<br />corn borer, the European corn borer, and the corn root<br />worm. The value of crop losses due to the insect pests in<br />America is $2.6 billion, Asia $1.6 billion, Africa $0.8 billion,<br />and Europe $0.6 billion. Prior to the use of Bt corn, farmers<br />used a lot of insecticides to control the insect pests.<br />Following introduction of the Bt corn in 1996, this crop has<br />been grown over 21 million hectares by millions of farmers<br />from 13 countries in North America, Latin America, Asia,<br />Africa and Europe. Globally, the farmers had been benefited<br />by grownt the Bt corn. The benefits varies, dependent on<br />countries and level of the corn borer infestations. In 2001,<br />the US farmers gained $125 million benefit from growing the<br />crop. In 2002, farmers in Spain gained 11-15 million benefit<br />from the Bt corn alone. During the period of 2003-2005, corn<br />farmers in the Philippines gained $8 million from the Bt corn.<br />Bt corn has not been grown commercially in Indonesia,<br />although Bt corn MON810 has been declared as save to<br />release in the environment by the Indonesian Biosafety<br />Committee. In 2001-2002, farmers in South Sulawesi with<br />had grown Bt cotton, this was the first time Bt crop in the<br />country since the placement and implementation of the<br />biosafety regulation by the Indonesian Government in 1998.</p>
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Fattah, Abdul, Asriyanti Ilyas, Salim Salim, Idaryani Djamaluddin, and Abd Syukur. "Effect of several types of insecticide on predator population and damage intensity due to soybean pest attack in South Sulawesi, Indonesia." Journal of Agricultural and Crop Research 8, no. 11 (November 4, 2020): 272–77. http://dx.doi.org/10.33495/jacr_v8i11.20.182.
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Spodoptera litura was one of the pests that caused soybean seed yield decrease in South Sulawesi. In order to challenge the pests, farmers still largely choose chemical insecticides. This research aimed to establish effectiveness level of several insecticide types that were frequently used by farmers. The design used was Randomized Block Design with 7 treatments (6 insecticide types and 1 control) with 3 replications. The insecticide types examined were: 1) acephate 75%, 2) thiamethoxam 200 g/L + chlorantraniliprole 100 g/L, 3) permethrin 200 g/L, 4) chlorpyrifos 550 g/L + cypermethrin 60 g/L, 5) deltamethrin 50 g/L, 6) profenofos 500 g/L, and 7) polyculture, soybean + corn (control). The result showed that insecticide type of thiamethoxam 200 g/L + chlorantraniliprole 100 g/L was the most effective insecticide to control S. litura with soybean leaves damage intensity (15.19%) and population of Bemisia tabaci whitefly (5.07 tails plant-1). However, thiamethoxam 200 g/L + chlorantraniliprole 100 g/L mostly killed Lycosa sp. predator (0.63 tails plant-1) and Crocothemis servillia (3.26 tails plant-1). The highest predator population was found in multiple cropping of soybean and corn, C. servillia (3.94 tails plant-1), and Lycosa sp. (3.26 tails plant-1). The insecticide of chlorpyrifos 550 g/L + cypermethrin 60 g/L were effective to control soybean pod borer pest Etiella zinckenella (2.40%). Furthermore, insecticide of deltamethrin 50 g/L was effective to control Aphis glycines pest (2.05 tails plant-1). Several types of insecticides are effective in controlling S. litura, N. viridula, and B. tabasi pests, but these insecticides are also effective in killing predators. The highest predator population is soybean-corn intercropping. Keywords: Soybean, insecticides, pests, intensity of damage, predators, seed yields.
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Chhetri, Vivek Thapa, Resham G.C., Sanup Chaudhary, Sachin Timilsina, and Subash Gautam. "Pests, pathogens, pathogenic diseases, and diseases control strategies of sal (Shorea robusta) in Nepal." Archives of Agriculture and Environmental Science 6, no. 2 (June 25, 2021): 210–17. http://dx.doi.org/10.26832/24566632.2021.0602013.
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Sal (Shorea robusta) is one of the most indispensable species in Nepal, both ecologically and economically. This paper aims to provide updated guidance for the management and protection of this species in the future from various pests and pathogens. We reviewed 38 articles from Google Scholar and Research gate with keywords "Shorea robusta”, “Hoplocerambyx spinicornis”, “Polyporus shoreae”, “Heart rot”. S. robusta has the most insect fauna among the forest tree species. Out of the 346 insects reported on S. robusta, around 155 species of insects are associated with living trees. Hoplocerambyx spinicornis is the most destructive insect pest, wreaking havoc on S. robusta. Polyporous shoreae is the main cause of root rot in S. robusta, and spreads through root contact or root grafting. Heart rot in S. robusta is caused by the fungi Hymenochaete rubiginosa, Fomes caryophylli, and F. fastuosus. During the harvesting of S. robusta, the majority of the tree was observed to be faulty, resulting in a large amount of waste wood. The best way to determine the pathogen's "Achilles' heel" is to consider its life cycle. The Nepalese famous saying "prevention is better than cure" may be applicable in the management of S. robusta insect pests and pathogens. The current paper critically addresses these issues and argues the need for an improvised package of activities for insect pests, pathogens, prevention, and their control.
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Liu, J., H. D. Luo, W. Z. Tan, and L. Hu. "First Report of a Leaf Spot on Conyza sumatrensis Caused by Phoma macrostoma in China." Plant Disease 96, no. 1 (January 2012): 148. http://dx.doi.org/10.1094/pdis-03-11-0228.
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Conyza sumatrensis (Asteraceae), an annual or biennial plant, is native to North and South America. It is an invasive, noxious weed that is widespread in southern and southeastern China. It invades farm land and causes great losses to dry land crops, including wheat, corn, and beans. It also reduces biological diversity by crowding out native plants in the infested areas (3,4). During a search for fungal pathogens that could serve as potential biological control agents of C. sumatrensis, a leaf spot disease was observed in 2010 in Chongqing, China. An isolate (SMBC22) of a highly virulent fungus was obtained from diseased leaves. Pathogenicity tests were performed by placing 6-mm-diameter mycelial disks of 7-day-old potato dextrose agar (PDA) cultures of SMBC22 on leaves of 15 healthy greenhouse-grown plants of C. sumatrensis; the same number of control plants was treated with sterile PDA disks. Treated plants were covered with plastic bags for 24 h and maintained in a growth chamber with daily average temperatures of 24 to 26°C, continuous light (3,100 lux), and high relative humidity (>90%). Lesions similar to those observed in the field were first obvious on the SMBC22-inoculated leaves 3 days after inoculation. Symptoms became severe 7 to 9 days after inoculation. Control plants remained healthy. The fungus was reisolated from inoculated and diseased leaves and it was morphologically the same as SMBC22. The pathogenicity test was conducted three times. A survey of 10 southern and southeastern Chinese provinces revealed that the disease was widespread and it attacked leaves and stems of seedlings and mature plants of C. sumatrensis. Lesions on leaves were initially small, circular, and water soaked. The typical lesion was ovoid or fusiform, dark brown, and surrounded by a yellow halo. The spots coalesced to form large lesions and plants were often completely blighted. Fungal colonies of SMBC22 on PDA plates were initially white and turned dark gray. Colonies were circular with smooth edges with obvious rings of pycnidia on the surface. Aerial hyphae were short and dense. Pycnidia, black and immersed or semi-immersed in the medium, were visible after 12 days of incubation. Pycnidia were 72 to 140 μm in diameter. Conidia were produced in the pycnidia and were hyaline, unicellular, ellipsoidal, and 4.4 to 6.1 × 1.6 to 2.2 μm. To confirm identification of the fungus, genomic DNA was extracted from mycelia of a 7-day-old culture on PDA at 25°C (2). The internal transcribed spacer (ITS) gene of rDNA was amplified using primers ITS4/ITS5. The gene sequence was 524 bp long and registered in NCBI GenBank (No. HQ645974). BLAST analysis showed that the current sequence had 99% homology to an isolate of Phoma macrostoma (DQ 404792) from Cirsium arvense (Canada thistle) in Canada and reported to cause chlorotic symptoms on that host plant (1). To our knowledge, this is the first report of P. macrostoma causing disease on C. sumatrensis in China. P. macrostoma, thought of as a biocontrol agent of broadleaf weeds in Canada, has been patented in the United States. The current isolate of P. macrostoma is considered as a potential biocontrol agent of C. sumatrensis. References: (1) P. R. Graupner et al. J. Nat. Prod. 66:1558, 2004. (2) S. Takamatsu et al. Mycoscience 42:135, 2001. (3) W. Z. Tan et al. Page 177 in: Manual of Emergency Control Technology Invasive Pests in China. G. L. Zhang, ed. Science Press, Beijing, 2010. (4) C. Wang et al. J. Wuhan Bot. Res. 28:90, 2010.
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Agasyeva, Irina. "Ectoparasite Habrobracon Hebetor Say Is an Efficient Biological Control Agent of Lepidopteran Pests." E3S Web of Conferences 285 (2021): 03010. http://dx.doi.org/10.1051/e3sconf/202128503010.
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Ectoparasite Habrobracon hebetor Say is one of the most widely used biological controllers in biological plant protection against a number of harmful lepidopterans, including especially dangerous pests of corn, soy, fruit and vegetable crops. As a result of research conducted in 2017, food specialization and parasitic activity of three different populations of H.hebetor were studied. Two races have been identified for mass rearing and application: pyralid and leaf roller (against corn moth, bean pod borer, apple and plum moths), and pyralid owl-moth (against cotton moth, corn borer, bean pod borer and boxwood moth). As a result of studies of biological features and trophic needs, it has been determined that caterpillars of mill moth (Ephestia cuhniellia Zella) should be used as a host insect for laboratory cultivation of the stock population of the Habrobracon pyralid and leaf roller race (race No. 1). For the introduced from South Kazakhstan the H.hebetor pyralid and noctuid race the most productive rearing is on the caterpillars of large bee moth (Galleria mellonela L.). Optimal temperature for rearing of both races is 26-28 ° C, relative air humidity is 70% and photoperiod is not less than 16 hours. It has been noticed that before laying eggs on the host’s caterpillars, the Habrobracon female preliminarily paralyzes the victim, piercing the sheath with ovipositor. As a result, the caterpillar stops eating and is immobilized. In 3-4 days larvae hatch out of the laid on the caterpillar eggs. The larvae feed on the contents of the caterpillars for 4-5 days, then pupate and after 6-8 days an adult insect leaves the cocoon. The development of one generation lasts 13-16 days, one cocoon includes one parasite. 1,000 large bee moth caterpillars used for infection provide on average 5.8-6.0 thousand cocoons, of which an average of 4.5-4.7 thousand parasites fly out.
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Calles-Torrez, Veronica, Janet J. Knodel, Mark A. Boetel, B. Wade French, Billy W. Fuller, and Joel K. Ransom. "Field-Evolved Resistance of Northern and Western Corn Rootworm (Coleoptera: Chrysomelidae) Populations to Corn Hybrids Expressing Single and Pyramided Cry3Bb1 and Cry34/35Ab1 Bt Proteins in North Dakota." Journal of Economic Entomology 112, no. 4 (May 22, 2019): 1875–86. http://dx.doi.org/10.1093/jee/toz111.
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Abstract Northern, Diabrotica barberi Smith & Lawrence, and western, D. virgifera virgifera LeConte, corn rootworms (Coleoptera: Chrysomelidae) are major economic pests of corn, Zea mays L., in North America. Corn hybrids expressing Bacillus thuringiensis Berliner (Bt) toxins are commonly used by growers to manage these pests. Several cases of field-evolved resistance to insecticidal proteins expressed by Bt corn hybrids have been documented in many corn-producing areas of North America, but only for D. v. virgifera. In 2016, beetles of both species were collected from five eastern North Dakota corn fields and reared in a growth chamber. In 2017, larvae reared from those populations were subjected to single-plant bioassays to screen for potential resistance to Cry3Bb1, Cry34/35Ab1, and pyramided Cry3Bb1 + Cry34/35Ab1 Bt toxins. Our results provide the first documented report of field-evolved resistance in D. barberi to corn hybrids expressing Cry3Bb1 (Arthur problem population) and Cry34/35Ab1 (Arthur and Page problem populations, and the Ransom and Sargent populations) proteins in North America. Resistance to Cry3Bb1 was also observed in the Ransom population of D. v. virgifera. Increased larval survival on the pyramided Cry3Bb1 + Cry34/35Ab1 hybrid was observed in both species. No cross-resistance was evident between Cry3Bb1 and Cry34/35Ab1 in any of the D. barberi populations tested. Our experiments identified field-evolved resistance to Bt toxins in some North Dakota populations of D. barberi and D. v. virgifera. Thus, more effective control tools and improved resistance management strategies are needed to prolong the durability of this technology for managing these important pests.
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Jacob, Jens, Grant R. Singleton, and Lyn A. Hinds. "Fertility control of rodent pests." Wildlife Research 35, no. 6 (2008): 487. http://dx.doi.org/10.1071/wr07129.
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Ricefield rats (Rattus argentiventer) in south-east Asian rice fields and house mice (Mus domesticus) in Australian grain fields are major pest species. They cause damage before and after harvest and carry zoonotic diseases. For both species, management techniques have been pursued using the approach of immunocontraceptive vaccination. We review results from a series of enclosure and field studies conducted with these species to assess the effects of fertility control in small rodents. In the experiments, fertility control was simulated by tubal ligation, ovariectomy or progesterone treatment. A once-off sterilisation of 50–75% of enclosed founder females considerably reduced reproductive output of ricefield rat populations until the end of the reproductive period. In house mice, similar success was achieved when a sterility level of 67% of female founders and offspring was maintained. Repeated antifertility treatments are required because of the much longer breeding period of house mice versus ricefield rats. Comparing the results of enclosure trials with the outcome of simulation models suggests that partial compensation of treatment effects can occur through enhanced reproduction of the remaining fertile females and improved survival of juveniles. However, such compensatory effects as well as behavioural consequences of sterility in field populations are not likely to prevent the management effect at the population level. The challenge for effective fertility control of small rodents in the field is the wide-scale delivery of an antifertility treatment to founders at the beginning of the breeding season and to fertile immigrants that are recruited into the population, which otherwise contribute to the reproductive output at the population level. Future research efforts should focus on species-specific techniques and on agents that can be effectively delivered via bait.
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Xie, Y. S., D. Gagnon, J. T. Arnason, B. J. R. Philogène, J. D. H. Lambert, J. Kaminski, P. Morand, G. Timmins, and N. H. Werstiuk. "EFFECTS OF AZADIRACHTIN ON THE WESTERN CORN ROOTWORM, DIABROTICA VIRGIFERA VIRGIFERA (LECONTE) (COLEOPTERA: CHRYSOMELIDAE)." Canadian Entomologist 123, no. 3 (June 1991): 707–10. http://dx.doi.org/10.4039/ent123707-3.
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Corn rootworm (Diabrotica spp., Coleoptera: Chrysomelidae) is a serious pest insect of corn production. It is estimated that farmers in the United States have losses of over $1 billion each year as a result of crop damage and treatment costs for this pest (Metcalf 1986). Chemical control is the main method of suppressing corn rootworm populations and the amount of insecticide used against Diabrotica spp. is greater than for any other pests of corn in the United States (Suguiyama and Carlson 1985). The development of nontoxic and biodegradable alternatives to chemical insecticides is highly desirable.
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Miah, A., NR Saha, MY Ali, M. Kamrujjaman, MSMS Parvej, and S. Farabi. "Genetic divergence analysis of deshi jute (Corchorus capsularis) based on fibre yield and its attributing traits." Progressive Agriculture 31, no. 1 (July 22, 2020): 26–35. http://dx.doi.org/10.3329/pa.v31i1.48309.
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Commercially important natural fibres considered as fiber of the future are obtained from the bark of two jute species (Corchorus capsularis L. and Corchorus olitorius L.), and they are cultivated in different south-east Asian countries including India and Bangladesh. Unfortunately, they are characterized by narrow genetic variability for adaptability to not only various agronomic environments, but also fibre yield, quality and susceptibility to diseases and pests. Therefore, research on genetic divergence in this crop is very important in formulating a successful breeding program for evolving cultivars superior in both yield and quality to cater to the increasing demand of value added jute products in the domestic and international markets. In our study, which was conducted at the Central Jute Research Experiment Station of Bangladesh Jute Research Institute (BJRI), during Kharif seasons of 2015.44 accessions of deshi jute (Corchorus capsularis L.) originated from different countries and two varieties CVL-1 and CVE-3 (developed from Bangladesh Jute Research Institute) as check were investigated to study the genetic variability, genetic diversity and degree of association of different component characters related to fiber yield. The seeds of experimental plant materials were grown in Randomized Complete Block Design with three replications. Statistical analysis was run to find out the genotypic and phenotypic variances, correlations and cluster analysis for fibre yield related traits namely technical height (m), leaf angle (dg), leaf length (cm), leaf width (cm), petiole length (cm), node no., base diameter (mm), middle diameter (mm), top diameter (mm), core diameter (mm), dry fibre weight (g), dry stick weight (g). Highly significant differences were observed among the genotypes for all the characters. Substantial amounts of genotypic variance were also obtained for all characters. Fibre weight was significantly and positively correlated with node no., base diameter, middle diameter, top diameter and core diameter. The clustering pattern revealed considerable amount of genetic diversity observed among the genotypes studied here and the accessions were grouped into five clusters. From two years’ evaluation it was revealed that the accessions 2512, 2445, 2749 and 2533performed better in most of the cases than the control varieties CVL-1 and CVE-3. These accessions may be used as parents for future variety development program.
Progressive Agriculture 31 (1): 26-35, 2020
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Riley, T. J., B. A. Castro, C. Calix, and J. Rabb. "Evaluation of a Corn Seed Treatment and a T-Banded Insecticide for Control of Seedling Pests on Corn, 1997." Arthropod Management Tests 23, no. 1 (January 1, 1998): 203. http://dx.doi.org/10.1093/amt/23.1.203.
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Evans, D. C. "Traditional pest control in Ecuador: Effects of castor leaves on Coleoptera pests in corn." Tropical Pest Management 35, no. 2 (January 1989): 146–49. http://dx.doi.org/10.1080/09670878909371344.
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KOZIEL, MICHAEL G., NADINE B. CAROZZI, NALINI DESAI, GREGORY W. WARREN, JOHN DAWSON, ERIK DUNDER, KAREN LAUNIS, and STEPHEN V. EVOLA. "Transgenic Maize for the Control of European Corn Borer and Other Maize Insect Pests." Annals of the New York Academy of Sciences 792, no. 1 Engineering P (May 1996): 164–71. http://dx.doi.org/10.1111/j.1749-6632.1996.tb32502.x.
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Hoffmann, M. P., J. P. Nyrop, J. J. Kirkwyland, D. M. Riggs, D. O. Gilrein, and D. D. Moyer. "Sequential Sampling Plan for Scheduling Control of Lepidopteran Pests of Fresh Market Sweet Corn." Journal of Economic Entomology 89, no. 2 (April 1, 1996): 386–95. http://dx.doi.org/10.1093/jee/89.2.386.
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