Journal articles: 'Rice Rice blast disease'

1

Ebbole, Daniel J., Janna L. Beckerman, R. S. Zeigler, S. A. Leong, and P. S. Teng. "Rice Blast Disease." Mycologia 88, no. 3 (May 1996): 518. http://dx.doi.org/10.2307/3760894.

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Kato, Hajime. "Rice blast disease." Pesticide Outlook 12, no. 1 (2001): 23–25. http://dx.doi.org/10.1039/b100803j.

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3

Oerke, E. C. "Rice blast disease." Agricultural Systems 51, no. 3 (July 1996): 367–69. http://dx.doi.org/10.1016/0308-521x(96)86783-7.

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4

Dadley-Moore, Davina. "Understanding rice blast disease." Nature Reviews Microbiology 4, no. 5 (May 2006): 323. http://dx.doi.org/10.1038/nrmicro1422.

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Skamnioti, Pari, and Sarah J. Gurr. "Against the grain: safeguarding rice from rice blast disease." Trends in Biotechnology 27, no. 3 (March 2009): 141–50. http://dx.doi.org/10.1016/j.tibtech.2008.12.002.

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Amayo, R., Teddy Oparok, Jimmy Lamo, Silue Drissa, Richard Edema, and Geoffrey Tusiime. "Rice Blast Prevalence in Smallholder Rice Farmlands in Uganda." Journal of Agricultural Science 12, no. 10 (September 15, 2020): 105. http://dx.doi.org/10.5539/jas.v12n10p105.

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Rice blast disease remains the most important contributor to low and stagnated rice yields in Uganda. However, the role of the smallholder farming system in shaping the prevalence of the disease in the country is not known. In 2015B and 2016A, we surveyed smallholder rice farmlands in 27 districts of Uganda and recorded blast incidence, severity, and symptoms expression. Infected rice samples taken from the infected plants were sub-cultured on PDA media to confirm the pathogen and obtain isolates for the establishment of a core collection for breeding work. Rice blast prevalence in the districts varied from 50-100% and the national average stood at 72.61%, higher than that recorded five years ago. Mean incidence and severity varied significantly (< 0.001) with the highest incidence (96.8%) recorded in Luwero district and the least (21.3%) was recorded in the Amuru district. However, the eastern region recorded the highest average incidence (74.5%) followed by the central, the northern, and Mid-western regions. In the rice ecologies, the highest blast incidence was recorded in the rain-fed lowland rice (72.18%) followed by irrigated lowland (59.53%) and rain-fed upland rice (47.27%). This is the first report on the prevalence of blast in smallholder rice farmlands in Uganda and showed a higher prevalence of the disease.

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Mgonja, A. P. "Resistance to Rice Blast Disease of Some Land Rice Verieties." East African Agricultural and Forestry Journal 51, no. 1 (July 1985): 61–62. http://dx.doi.org/10.1080/00128325.1985.11663463.

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Petkevych, Z. Z., T. V. Dudchenko, and V. V. Dudchenko. "Trait collection of rice by resistance to rice blast." Genetičnì resursi roslin (Plant Genetic Resources), no. 24 (2019): 89–100. http://dx.doi.org/10.36814/pgr.2019.24.07.

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Aim. To study the genetic diversity of rice in terms of resistance to disease, to find sources of resistance, to select reference varieties and to form a trait collection of rice accessions with resistance to Pyricularia oryzae Cav. Results and Discussion. The study was carried out in an infectious-provocative nursery in the field and greenhouse of the Institute of Rice in compliance with the methodical guidelines in 2003 – 2016. In of the south Ukrainian, Pyricularia oryzea is the most harmful for rice. The article presents the results on forming a trait collection studying rice accessions. It presents the results of 7-year studies (2010 – 2016) on the search for sources for resistance to the pathogen among 190 rice accessions of different eco-geographical origin. In the years with various meteorological conditions and various development of disease, we revealed several sources of resistance to the pathogen. There were 64 disease-resistant accessions (33,7 %). Most of the accessions under investigation were medium-resistant to Pyricularia oryzae (50,5%). In the period of 2003 – 2004 and 2007 – 2009, 58 rice accessions were studied on artificial infection. In the greenhouse, 19 (33,7%) resistant accessions were found. Most of the accessions under investigation were susceptible (46,6%) and medium-resistant to Pyricularia oryzae (20,7 %). Conclusions. The trait collection comprising 58 accessions belonging to 13 varieties from 8 foreign countries has been formed. Reference varieties and sources of resistance to disease in combination with a set of economic features were defined. These accessions are of great interest to breeding for valuable agronomic traits as they combine resistance to disease with several economically valuable characteristics. The collection is of great importance for achieving different scientific and breeding objectives. All the valuable material will be transferred for introduction in breeding.

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9

HAMER, J. E. "Molecular Probes for Rice Blast Disease." Science 252, no. 5006 (May 3, 1991): 632–33. http://dx.doi.org/10.1126/science.252.5006.632.

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Liu, Yan, Xinshuai Qi, Dave R. Gealy, Kenneth M. Olsen, Ana L. Caicedo, and Yulin Jia. "QTL Analysis for Resistance to Blast Disease in U.S. Weedy Rice." Molecular Plant-Microbe Interactions® 28, no. 7 (July 2015): 834–44. http://dx.doi.org/10.1094/mpmi-12-14-0386-r.

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Understanding the genetic architecture of adaptation is of great importance in evolutionary biology. U.S. weedy rice is well adapted to the local conditions in U.S. rice fields. Rice blast disease is one of the most destructive diseases of cultivated rice worldwide. However, information about resistance to blast in weedy rice is limited. Here, we evaluated the disease reactions of 60 U.S. weedy rice accessions with 14 blast races, and investigated the quantitative trait loci (QTL) associated with blast resistance in two major ecotypes of U.S. weedy rice. Our results revealed that U.S. weedy rice exhibited a broad resistance spectrum. Using genotyping by sequencing, we identified 28 resistance QTL in two U.S. weedy rice ecotypes. The resistance QTL with relatively large and small effects suggest that U.S. weedy rice groups have adapted to blast disease using two methods, both major resistance (R) genes and QTL. Three genomic loci shared by some of the resistance QTL indicated that these loci may contribute to no-race-specific resistance in weedy rice. Comparing with known blast disease R genes, we found that the R genes at these resistance QTL are novel, suggesting that U.S. weedy rice is a potential source of novel blast R genes for resistant breeding.

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Kumar, Vipin, Rashmi Nigam, Raju ., Yachna Gupta, and Gyan Manjri Rao. "Blast disease of basmati rice and its management." International Journal of Agricultural Invention 2, no. 01 (June 30, 2017): 87–91. http://dx.doi.org/10.46492/ijai/2017.2.1.20.

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Basmati rice is an important staple food grain crop in the world. Basmati rice is an important export commodity among the food grains. The biotic and abiotic factors are adversely affected the Basmati rice but Basmati rice blast caused by Pyricularia oryzae Cavara (synonym Pyricularia grisea Sacc). The anamorph of Magnaporthe grisea (Herbert), is one of the most destructive and wide spread diseases as compared to other diseases of Basmati rice. It causes leaf blast, neck blast and panicle blast of paddy. This disease generally causes yield loss of 10-20 percent but in severe cases yield loss may reach up to 80 percent. Management of blast disease using healthy seed, resistance varieties, many biological controls like as T. harzianum, T. viride and P. fluorescens @10g/kg by seed treatment and foliar spray. The chemical control by fungicides such as carbendazim, tricyclazole, isoprothilane, tebuconazole, hexaconazole reduced leaf but not neck blast; on the contrary, tricyclazole was effective against neck blast and panicle blast.

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Shi, Jun, Deqiang Li, Yan Li, Xiaoyan Li, Xiaoyi Guo, Yiwan Luo, Yuangen Lu, et al. "Identification of rice blast resistance genes in the elite hybrid rice restorer line Yahui2115." Genome 58, no. 3 (March 2015): 91–97. http://dx.doi.org/10.1139/gen-2015-0005.

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Rice blast, caused by the ascomycete fungus Magnaporthe oryzae, is one of the most serious rice diseases worldwide. We previously developed an elite hybrid rice restorer line with high resistance to rice blast, Yahui2115 (YH2115). To identify the blast resistance genes in YH2115, we first performed expression profiling on previously reported blast resistance genes and disease assay on monogenic lines, and we found that Pi2, Pi9, and Pikm were the most likely resistance candidates in YH2115. Furthermore, RNA interference and linkage analysis demonstrated that silencing of Pi2 reduced the blast resistance of YH2115 and a Pi2 linkage marker was closely associated with blast resistance in an F2 population generated from YH2115. These data suggest that the broad-spectrum blast resistance gene Pi2 contributes greatly to the blast resistance of YH2115. Thus, YH2115 could be used as a new germplasm to facilitate rice blast resistance breeding in hybrid rice breeding programs.

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Hashim, Ibrahim, Delphina P. Mamiro, Robert B. Mabagala, and Tadele Tefera. "Smallholder Farmers’ Knowledge, Perception and Management of Rice Blast Disease in Upland Rice Production in Tanzania." Journal of Agricultural Science 10, no. 7 (June 8, 2018): 137. http://dx.doi.org/10.5539/jas.v10n7p137.

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The objective of this paper was to investigate farmers’ knowledge and management of rice blast disease in Tanzania. Farmers’ household survey was conducted in five districts namely Mvomero, Morogoro rural, Ulanga, Korogwe and Muheza in April and May 2017. Data were collected through face-to-face interviews using semi-structured questionnaire and observations made through transect walks across selected villages. Farmers observed symptoms of rice blast disease for the first time in the past 3 to 10 years, with higher severity of blast disease in April to May each year. About 46.3% of the respondents were not aware of the cause and spread of rice blast disease. About 39.9% of the respondents associated rice blast disease with drought, high rainfall and temperature (8.7%) and soil fertility problems (5.1%). About 18.7% of the farmers reported burning of crop residues, 17.0% use of ash, 4.0% use of nitrogen fertilizer and 6.3% application of fungicide for management of rice blast disease. The majority (54.0%) of farmers did not apply any management method. Most farmers planted local upland rice varieties, with only 7.7% using improved varieties. About 69.6% of the respondents shared information on disease management among themselves. Lack of knowledge, ability to afford and unavailability of effective blast disease control methods were reported to affect the management of the disease. Strengthening the capacity of farmers to identify the disease and proper management practices will sustainably solve the problem of rice blast disease in upland rice production.

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Long, D. H., J. C. Correll, F. N. Lee, and D. O. TeBeest. "Rice Blast Epidemics Initiated by Infested Rice Grain on the Soil Surface." Plant Disease 85, no. 6 (June 2001): 612–16. http://dx.doi.org/10.1094/pdis.2001.85.6.612.

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Field experiments were conducted in 1996 and 1997 with a marked strain of Pyricularia grisea to determine if inoculum from infested rice grain could cause primary infections and sustain a rice blast epidemic during the growing season by giving rise to leaf, collar, and neck symptoms. The marked strain, a sulfate nonutilizing (sul) mutant of P. grisea, was grown on autoclaved rice seed for 7 days at 25°C. Infested rice grains were applied to the soil surface at the time of plant emergence (approximately 10 days after planting) at densities of 0, 0.5, 5, 25, and 50 grains per 0.1 m2 in plots planted to the blast susceptible cv. M-201. Leaf blast symptoms were first detected in the plots containing infested grain 35 days after plant emergence in both 1996 and 1997. The sul mutant was isolated from more than 90% of the lesions sampled from rice seedlings 35 to 45 days after plant emergence. Leaf blast increased more rapidly in plots with 25 and 50 infested grains per 0.1 m2 than in plots with less inoculum pressure (0.5 and 25 infested grains per 0.1 m2), although in 1996, leaf blast incidence recorded at midseason in plots containing 0.5 and 5 infested grains per 0.1 m2 was 41 and 55%, respectively. At the end of both seasons, the sul mutant was recovered from over 90% of the leaf, collar, and neck blast lesions except for one sample date in 1996. Rice blast was not detected in the control plots (no infested grain) in 1997 and not until 65 days after planting in 1996. Comparisons of disease progress on leaves between the marked strain and the parental wild-type strain under field conditions indicated that development of disease caused by the sul mutant was similar to disease caused by the wild-type strain.

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Wang, Xueyan, Melissa H. Jia, Pooja Ghai, Fleet N. Lee, and Yulin Jia. "Genome-Wide Association of Rice Blast Disease Resistance and Yield-Related Components of Rice." Molecular Plant-Microbe Interactions® 28, no. 12 (December 2015): 1383–92. http://dx.doi.org/10.1094/mpmi-06-15-0131-r.

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Robust disease resistance may require an expenditure of energy that may limit crop yield potential. In the present study, a subset of a United States Department of Agriculture rice core collection consisting of 151 accessions was selected using a major blast resistance (R) gene, Pi-ta, marker and was genotyped with 156 simple sequence repeat (SSR) markers. Disease reactions to Magnaporthe oryzae, the causal agent of rice blast disease, were evaluated under greenhouse and field conditions, and heading date, plant height, paddy and brown seed weight in two field environments were analyzed, using an association mapping approach. A total of 21 SSR markers distributed among rice chromosomes 2 to 12 were associated with blast resistance, and 16 SSR markers were associated with seed weight, heading date, and plant height. Most noticeably, shorter plants were significantly correlated with resistance to blast, rice genomes with Pi-ta were associated with lighter seed weights, and the susceptible alleles of RM171 and RM6544 were associated with heavier seed weight. These findings unraveled a complex relationship between disease resistance and yield-related components.

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Teerasan, Wattanaporn, Ing-on Srikaew, Kritkittisak Phaitreejit, Sureeporn Kate-Ngam, and Chatchawan Jantasuriyarat. "Gene-specific marker screening and disease reaction validation of blast resistant genes, Pid3, Pigm and Pi54 in Thai landrace rice germplasm and recommended rice varieties." Plant Genetic Resources: Characterization and Utilization 17, no. 5 (July 18, 2019): 421–26. http://dx.doi.org/10.1017/s1479262119000224.

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AbstractRice blast caused by the fungal pathogen Magnaporthe oryzae, is one of the most devastating diseases in rice production worldwide. Information on rice varieties with the blast disease resistance gene is important for rice cultivar development. This study identified rice blast resistant genes in 226 rice cultivars including 203 Thai landrace rice cultivars (19 upland rice cultivars from the North, 99 lowland rice cultivars from the Northeast, 45 floating rice cultivars from the Northeast and 40 cultivars from the South), 21 recommended rice varieties and two susceptible varieties ‘KDML105’ and ‘Nipponbare’ by using gene-specific markers for the blast resistant genes Pid3, Pi54 and Pigm. Results showed that 159 cultivars have at least one resistant gene and four cultivars have all three resistant genes. These results indicate that Thai landrace rice is a valuable source of rice blast resistant genes for rice breeding programmes.

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Asibi, Aziiba Emmanuel, Qiang Chai, and Jeffrey A. Coulter. "Rice Blast: A Disease with Implications for Global Food Security." Agronomy 9, no. 8 (August 15, 2019): 451. http://dx.doi.org/10.3390/agronomy9080451.

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Rice blast is a serious fungal disease of rice (Oryza sativa L.) that is threatening global food security. It has been extensively studied due to the importance of rice production and consumption, and because of its vast distribution and destructiveness across the world. Rice blast, caused by Pyricularia oryzae Cavara 1892 (A), can infect aboveground tissues of rice plants at any growth stage and cause total crop failure. The pathogen produces lesions on leaves (leaf blast), leaf collars (collar blast), culms, culm nodes, panicle neck nodes (neck rot), and panicles (panicle blast), which vary in color and shape depending on varietal resistance, environmental conditions, and age. Understanding how rice blast is affected by environmental conditions at the cellular and genetic level will provide critical insight into incidence of the disease in future climates for effective decision-making and management. Integrative strategies are required for successful control of rice blast, including chemical use, biocontrol, selection of advanced breeding lines and cultivars with resistance genes, investigating genetic diversity and virulence of the pathogen, forecasting and mapping distribution of the disease and pathogen races, and examining the role of wild rice and weeds in rice blast epidemics. These tactics should be integrated with agronomic practices including the removal of crop residues to decrease pathogen survival, crop and land rotations, avoiding broadcast planting and double cropping, water management, and removal of yield-limiting factors for rice production. Such an approach, where chemical use is based on crop injury and estimated yield and economic losses, is fundamental for the sustainable control of rice blast to improve rice production for global food security.

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DWIPA, INDRA, AUZAR SYARIF, IRFAN SULIANSYAH, and ETTI SWASTI. "West Sumatra Brown Rice resistance to Brown Planthopper and Blast Disease." Biodiversitas Journal of Biological Diversity 19, no. 3 (May 1, 2018): 893–98. http://dx.doi.org/10.13057/biodiv/d190318.

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Dwipa I, Syarif A, Suliansyah I, Swasti E. 2018. West Sumatra Brown Rice resistance to Brown Planthopper and Blast Disease. Biodiversitas 19: 893-898. Brown rice is a highly nutritious rice widely consumed as the carbohydrate substitute of common rice. Brown rice resistance to biotic stress is one of indicators of a superior variety. Our study aimed to analyze the response of several brown rice genotypes from West Sumatra to brown planthopper attack and blast disease. This study comprised two experiments, the resistance assay to brown planthopper (Nilaparvata lugens (Stal.) and the resistance assay to blast fungi Pyricularia oryzae. The resistance assay to brown planthopper was done using randomized block design experiment with three replicates. Eighteen brown rice genotypes (15 brown rice, 2 black rice, and 1 control genotype) were tested in the assay. From 17 brown and black rice tested, 7 genotypes were resistant and 2 were moderately resistant. For blast resistance analysis, fifteen rice genotypes (13 brown rice and 2 black rice) were used. There was only 1 genotype highly resistant and 3 moderately resistant to blast disease among those 15 brown and black rice.

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Zeleke, Tekalign, Muluadam Birhan, and Wubneh Ambachew. "Survey and Identification of Rice Diseases in South Gondar Zone, Amhara Region, Ethiopia." Journal of Agriculture and Crops, no. 58 (August 15, 2019): 123–31. http://dx.doi.org/10.32861/jac.58.123.131.

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Disease surveys were conducted in rice grown districts of Libokemkem, Dera and Fogera in south Gondar zone in 2016 and 2017 cropping seasons. The study was designed to identify and record rice disease flora, their distribution in the districts, prioritize according to the importance and document for future use. Forty-six and 48 rice fields were assessed from nine Peasant Association (PA) in 2016 and 2017 cropping seasons, respectively. Rice diseases; Leaf blast, Panicle Blast, Brown spot, Sheath rot, Sheath brown rot, Sheath Blight, Bacterial blight, Rice Yellow Motile Virus, Kernel smut, Downy mildew were identified in 2016 cropping season and nine rice diseases: Leaf blast, Panicle Blast, Neck Blast, Node blast, Brown spot, Sheath rot, Sheath brown rot, Rice Yellow Motile Virus, Kernel smut were identified in 2017. The overall mean prevalence of sheath rot and sheath brown rot diseases were above 60%, while the others had prevalence below 21%. The incidences and severities of these two diseases were higher than the other diseases implying that both diseases were important. In the present studies many rice diseases were recorded in lowland ecosystem as compared to upland ecosystem. From the assessment X-jigna cultivar was more susceptible to rice disease and followed by Gumera. The results indicate that a sheath rot, and sheath brown rot, were important across the districts and years. Loss assessment studies should be initiated in order to know the yield damage caused by the diseases.

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Khedkar, DT, PG Borkar, RA Raut, VM Karade, and RA Karande. "Integrated management of blast disease of rice." International Journal of Chemical Studies 8, no. 4 (July 1, 2020): 3158–59. http://dx.doi.org/10.22271/chemi.2020.v8.i4am.10135.

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Kamel, Serag-El-Din, Thoraya El-Bigawi, Ismail Ismail, and Mohamed Sehly. "Epidemiology of Rice Blast Disease in Egypt." Journal of King Abdulaziz University-Educational Sciences 1, no. 1 (1988): 51–58. http://dx.doi.org/10.4197/edu.1-1.4.

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Ramesh, S., and D. Vydeki. "Rice-Blast Disease Monitoring Using Mobile App." International Journal of Engineering & Technology 7, no. 3.6 (July 4, 2018): 400. http://dx.doi.org/10.14419/ijet.v7i3.6.16011.

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This research paper focuses on implementation of image analysis algorithms on captured images for the purpose of detecting crop diseases and monitored through Mobile App. The purpose of this research is to find out the diseases in early stage, and reduce the yield loss. The system design includes sensors, controller, image analysis algorithm, Cloud storage and mobile app. Using the USB camera, images in the farm are captured and processed by controller module. This is sent to the cloud, which can be accessed by mobile App or remote user. Various image processing algorithms were used to process the images. The results are presented in this paper.

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Varma, Yamini CK, and P. Santhakumari. "Biointensive management of blast disease of rice." Oryza-An International Journal on Rice 58, no. 2 (June 30, 2021): 317–36. http://dx.doi.org/10.35709/ory.2021.58.2.8.

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Blast of rice caused by Pyricularia grisea (Cooke.) Sacc. (Teleomorph :Magnaporthe oryzae) is a serious disease of rice and causes considerable reduction in yield. Overdose and untimely application of chemical fungicides disturb the rice ecosystem, pollute the environment and induce resistant mutants of the pathogen. An ecofriendly integrated disease management programme should be implemented to avoid overuse of a single control method and fight against genetic resistance. Salicylic acid (0.01ml/ l) and Benzoic acid (0.01ml/ l) proved superior in inducing disease resistance among different inducers tested at Regional Agricultural Research Station, Pattambi, Palakkdad district, under Kerala Agricultural University under green house conditions. As an integrated approach, Palmarosa oil + Carbendazim and Palmarosa oil+ Salicylic acid were the most effective treatments .Compatibility studies under in vitro conditions showed that Trichoderma harzianum and fluorescent pseudomonad were compatible to each other, and also palmarosa oil and Neemazal were compatible with Trichoderma harzianum and Fluorescent pseudomonad. For the management of blast disease under field conditions with high B:C ratio, Palmarosa oil (0.1%) + Carbendazim (0.1%)was the best treatment followed by Trichoderma (2%) + Fluorescent pseudomonad (2%)+ Palmarosa oil (0.1%).

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Eka Kusumawati, Dian, and Istiqomah Istiqomah. "POTENSI AGENSIA HAYATI DALAM MENEKAN LAJU SERANGAN PENYAKIT BLAS (Pyricularia oryzae) PADA TANAMAN PADI." VIABEL: Jurnal Ilmiah Ilmu-Ilmu Pertanian 14, no. 2 (November 11, 2020): 1–13. http://dx.doi.org/10.35457/viabel.v14i2.1235.

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Blast disease is an important disease that affects many rice plants. Blasts can damage rice leaves (leaf blasts), nodes (node blasts), neck blasts, colar blasts and rice grains. Symptoms on the leaves are rhombic-shaped spots with a tapered tip. The center of the patch is gray surrounded by brown to reddish brown on the edge of the spot. The color of the spots at the beginning of the symptoms is white or gray, surrounded by green-brown. Based on market demand, agricultural products that are safe and healthy for consumers as well as environmentally friendly are increasing, therefore controlling plant pathogens by using antagonistic microorganisms is one of the ways that must be considered. A number of microbes have been widely tested and are quite effective in controlling plant pathogens. PGPR and Streptomyces are biological agents that are able to reduce the level of attack of plant diseases, especially in rice blast disease. This study used a comparative method between rice cultivation and biological agent applications and rice cultivation without biological agents or control plant applications. The results obtained indicate that the application of biological agents can reduce the percentage of disease severity, reduce the percentage of infected leaves, the biological agents are also able to extend the incubation period, increase plant height growth, number of tillers and also the number of grains per panicle.

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Suwandi, Suwandi, Harman Hamidson, and Ahmad Muslim. "Penekanan Penyakit Blas Leher Malai Padi Menggunakan Ekstrak Kompos Jerami Padi." Jurnal Fitopatologi Indonesia 12, no. 3 (August 3, 2016): 104. http://dx.doi.org/10.14692/jfi.12.3.104.

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Blast is the most important disease of rice and may cause significant losses in the reclaimed tidal swamp of South Sumatra. Water extracts of fermented composts prepared from straws of the vigorous rice plant were tested in pot experiment for their ability to control blast. Rice variety Ciherang was grown on mixture of field soil and 1% diseased rice straw (v/v) collected from a tidal swamp rice field. Incidence of panicle blast was reduced by 71−87% in response to application of compost extract. The compost extract did not affect seed germination and plant height, instead, it increased the yield. The rice straw from healthy and vigorous plants is potential as a source for blast disease control.

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Suriani, Ni Luh, Dewa Ngurah Suprapta, Khamdan Khalimi, Anak Agung Ketut Darmadi, Ni Made Susun Parwanayoni, Novizar Nazir, Ahmad Zaki B Zaini, and Bohari M. Yamin. "Antagonism Trichoderma SP for Pressing Blast Disease on Red Bali Rice Plants (Oryza Sativa)." Journal of Advanced Research in Dynamical and Control Systems 11, no. 10-SPECIAL ISSUE (October 25, 2019): 70–76. http://dx.doi.org/10.5373/jardcs/v11sp10/20192777.

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Arora, Kirti, Amit Kumar Rai, Basavantraya N. Devanna, Banita Kumari, and Tilak Raj Sharma. "Functional validation of the Pi54 gene by knocking down its expression in a blast-resistant rice line using RNA interference and its effects on other traits." Functional Plant Biology 45, no. 12 (2018): 1241. http://dx.doi.org/10.1071/fp18083.

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Rice blast disease caused by Magnaporthe oryzae is one of the major diseases affecting the rice (Oryza sativa L.) crop. A major blast resistance gene, Pi54, has already been cloned and deployed in different rice varieties. To understand the role of Pi54 in providing rice blast resistance, we used the RNA interferences (RNAi) approach to knock down the expression of this gene. We showed a high frequency of Agrobacterium tumefaciens-mediated transformation of rice line Taipei 309 containing a single gene (Pi54) for blast resistance. Pi54 RNAi leads to a decreased level of Pi54 transcripts, leading to the susceptibility of otherwise M. oryzae-resistant rice lines. However, among the RNAi knockdown plants, the severity of blast disease varied between the lines. Histochemical analysis of the leaves of knockdown plants inoculated with M. oryzae spores also showed typical cell death and blast lesions. Additionally, Pi54 RNAi also showed an effect on the Hda3 gene, a florigen gene playing a role in rice flowering. By using the RNAi technique, for the first time, we showed that the directed degradation of Pi54 transcripts results in a significant reduction in the rice blast resistance response, suggesting that RNAi is a powerful tool for functional validation of genes.

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Jie, Feng, and Takano Makoto. "Identification of oxalate oxidase in rice defence system against rice blast." Chinese Journal of Agricultural Biotechnology 1, no. 3 (December 2004): 167–71. http://dx.doi.org/10.1079/cjb200438.

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AbstractA rice cDNA library was screened using OSK3 protein kinase as bait in a yeast two-hybrid system. The gene encoding oxalate oxidase was one of the positive clones interacting with OSK3 protein kinase. The interactions were verified by detecting expression of the reporter gene lacZ. The results suggest that oxalate oxidase is a downstream element in the disease resistance signal cascade mediated by OSK3 protein kinase in rice.

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Groth, D. E. "Azoxystrobin Rate and Timing Effects on Rice Head Blast Incidence and Rice Grain and Milling Yields." Plant Disease 90, no. 8 (August 2006): 1055–58. http://dx.doi.org/10.1094/pd-90-1055.

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Growing blast susceptible rice (Oryza sativa) cultivars often requires farmers to use fungicides to prevent significant reductions in rice grain and milling yields. Studies were conducted to determine the optimum rate and rice growth stage for single or multiple applications of azoxystrobin to control blast (Pyricularia grisea). Azoxystrobin was applied foliarly to naturally infected field plots in 2001 to 2005 at rates of 0.11, 0.17, and 0.22 kg a.i. ha-1 at boot (B) and heading (H) or only at H growth stages, and at 0.17 kg a.i. ha-1 at 5 (H+5), 10 (H+10), and 15 (H+15) days after H and B with low or high blast pressure. Head blast incidence (percent heads infected) was assessed 1 to 2 weeks before harvest. A fungicide application made at H, H+5, and B+H significantly reduced blast incidence with high and low disease pressure, resulting in significantly higher grain and head rice milling yields compared with unsprayed plots with high blast pressure. There were no significant effects of fungicide rate on blast development or yield following the H, B+H, and H+5 applications. With fungicide applications made at B, H+10, and H+15 days postheading, rice had higher disease incidence, resulting in lower grain and milling yields compared with rice receiving a heading application.

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Namai, Tsuneo. "Race differentiation of the rice blast fungus, Pyricularia oryzae, and environmentally friendly control of rice blast disease." Journal of General Plant Pathology 77, no. 6 (July 23, 2011): 350–53. http://dx.doi.org/10.1007/s10327-011-0328-8.

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Leiwakabessy, Christoffol, Fahra Inayatri, Edizon Jambormias, Jogeneis Patty, and Rhony E. Ririhena. "Ketahanan Enam Varietas Padi Terhadap Penyakit Blas (Pyricularia oryzea Cav.) pada Lahan Sawah Irigasi dan Sawah Tadah Hujan." JURNAL BUDIDAYA PERTANIAN 16, no. 2 (December 30, 2020): 147–56. http://dx.doi.org/10.30598/jbdp.2020.16.2.147.

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Rice (Oryza sativa L) is an economically important carbohydrate-producing plant that ranks second only to wheat. In Indonesia, Malaysia, the Philippines, and several other countries, rice is used as a staple food source. The commodity projection is expected in the coming years to grow to reach 70 percent. Blast disease is known as one of the main obstacles in rice cultivation today. Recommended control alternative to the disease was through the utilization of economically beneficial and environmentally friendly resistant varieties. The study used six varieties tested on different cultivated land and designed using a split plot experiment. The results showed that the resistance of the six varieties of rice to blast disease, with the criteria from susceptible to resistance was: Kabir07 (5%) and IPB8G (3%) classified as susceptible, followed by IPB9G 1.8% (moderate resistance), Inpari32 1.8% (moderate resistant), Fas Memeye 1.8% (moderate resistant), and IPB3S 1.2% (resistant). The study found that irrigated rice fields had a higher severity of blast disease than rain-fed rice fields. Keywords: blast disease, resistant variety, rice fields irrigated, rice rainfed lowland ABSTRAK Padi (Oryza sativa L) adalah tanaman penghasil karbohidrat penting secara ekonomi yang menempati peringkat kedua setelah gandum. Di Indonesia, Malaysia, Filipina, dan beberapa negara lain, padi digunakan sebagai sumber makanan pokok. Proyeksi komoditas tersebut diharapkan pada tahun-tahun mendatang tumbuh mencapai 70 persen. Penyakit blas dikenal sebagai salah satu kendala utama dalam budidaya padi saat ini. Alternatif yang direkomendasikan untuk pengendalian terhadap penyakit ini adalah melalui varietas tahan yang bermanfaat secara ekonomi dan ramah lingkungan. Penelitian bertujuan mengevaluasi ketahanan enam varietas padi pada lahan padi sawah dan sawah tadah hujan terhadap penyakit blas. Penelitian ini menggunakan enam varietas diuji pada lahan budidaya yang berbeda dan dirancang menggunakan percobaan petak terpisah. Hasil penelitian menunjukkan bahwa tingkat ketahanan keenam varietas padi terhadap penyakit blas, dengan kriteria dari rentan sampai tahan adalah: Kabir07 (5%) dan IPB8G (3%) tergolong rentan, diikuti oleh IPB9G 1,8% (moderat tahan), Inpari32 1,8% (moderat tahan), Fas Memeye 1,8% (moderat tahan), dan IPB3S 1,2% (tahan). Ditemukan bahwa lahan sawah irigasi memiliki keparahan penyakit blas lebih tinggi dibandingkan dengan sawah tadah hujan. Kata kunci: penyakit blas, sawah tadah hujan, sawah irigasi, varietas resisten

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Monsur, MA, M. Ahmed, A. Haque, QSA Jahan, TH Ansari, MA Latif, NCD Borma, MA Ali, MS Kabir, and BR Banik. "Cross Infection between Rice and Wheat Blast Pathogen Pyricularia oryzae." Bangladesh Rice Journal 20, no. 2 (September 29, 2017): 21–29. http://dx.doi.org/10.3329/brj.v20i2.34125.

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Cross infection between rice and wheat blast fungi was investigated in a series of experiments conducted under controlled glasshouse condition following a completely randomized design. Two rice (BRRI dhan29 and LTH) and two wheat (BARI Gom25 and BARI Gom26) varieties were grown in plastic trays as sole and rice-wheat mixed crop culture. Plants were artificially inoculated using virulent isolates of rice and wheat blast fungi. It was observed that irrespective of variety and crop culture technique, all the isolates of wheat blast fungus caused significant 100% plant infection on leaf typical leaf blast symptoms appeared on wheat seedlings but no blast symptom on rice. Conversely, the test-isolates of rice blast fungus did not produce any disease reaction on wheat seedlings, though leaf blast was observed on 100% rice plants. Therefore, we conclude that rice blast pathogen population is different from those of wheat blast pathogen (Pyricularia oryzae).Bangladesh Rice j. 2016, 20(2): 21-29

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Mukherjee, AK, NK Mohapatra, and P. Nayak. "Assessment of partial resistance to rice blast disease." ORYZA- An International Journal on Rice 55, no. 3 (2018): 363. http://dx.doi.org/10.5958/2249-5266.2018.00046.2.

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Kamel, S., Thoraya El-Bigawi, I. Ismail, and M. Afifi. "Types of Resistance to Blast Disease of Rice." Journal of King Abdulaziz University-Educational Sciences 1, no. 1 (1988): 39–49. http://dx.doi.org/10.4197/edu.1-1.3.

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KAMEL, S., THORAYA EL-BIGAWI, I. ISMAIL, and M. AFIFI. "Types of Resistance to Blast Disease of Rice." Journal of King Abdulaziz University-Educational Sciences 3, no. 1 (1990): 33–43. http://dx.doi.org/10.4197/edu.3-1.4.

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Bertoni, Gregory. "Functional ER Chaperone Required in Rice Blast Disease." Plant Cell 21, no. 2 (February 2009): 366. http://dx.doi.org/10.1105/tpc.109.210213.

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ISHIGURO, Kiyoshi. "Studies on the Forecast of Rice Blast Disease." Japanese Journal of Phytopathology 57, no. 3 (1991): 298. http://dx.doi.org/10.3186/jjphytopath.57.298.

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Bonman, J. M. "Durable resistance to rice blast disease-environmental influences." Euphytica 63, no. 1-2 (1992): 115–23. http://dx.doi.org/10.1007/bf00023917.

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Lai, X. H., M. A. Marchetti, and H. D. Petersen. "Comparative Slow-Blasting in Rice Grown Under Upland and Flooded Blast Nursery Culture." Plant Disease 83, no. 7 (July 1999): 681–84. http://dx.doi.org/10.1094/pdis.1999.83.7.681.

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Evaluation of rice for resistance to rice blast disease caused by Pyricularia grisea usually is conducted in upland (nonflooded) disease nurseries, although all commercial U.S. rice is produced under flood irrigation. Upland rice is more susceptible to leaf blast than is flooded rice, and the magnitude of this differential susceptibility can vary among cultivars. This 2-year study was undertaken to determine (i) the relationship between rates of disease development (slow-blasting) in upland and flooded rice and (ii) the value to a rice breeding program of establishing a flooded blast nursery, a facility far more difficult to manage than an upland nursery. Among 200 rice lines compared for leaf blast susceptibility under upland and flooded cultures, only 7 were rated as slightly more resistant under upland culture and 136 rated more resistant under flooded culture. Disease ratings under upland and flooded cultures were highly correlated (R = 0.819). Among 14 preselected cultivars over 2 years, disease development curves under upland and flooded cultures were highly correlated (R = 0.990). The cultivars with intermediate susceptibility under upland culture appeared to benefit most from flooded culture. Upland culture provided more opportunities to assess slow-blasting than did flooded culture, since many lines that produced susceptible-type lesions in upland culture failed to do so under flooded culture. It was concluded that adequate information on comparative leaf blast resistance among rice lines was attainable from upland blast nurseries and that routine evaluation of rice breeding lines for blast resistance in flooded nurseries was not necessary.

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Acharya, Basistha, Sunder Man Shrestha, Hira Kaji Manandhar, and Bedananda Chaudhary. "Screening of local, improved and hybrid rice genotypes against leaf blast disease (Pyricularia oryzae) at Banke district, Nepal." Journal of Agriculture and Natural Resources 2, no. 1 (October 24, 2019): 36–52. http://dx.doi.org/10.3126/janr.v2i1.26013.

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Rice (Oryza sativa) is the major cereal crop of Nepal which is being faced by the devastating rice blast disease caused by Pyricularia oryzae Cavara. An experiment was conducted to screen rice genotypes against leaf blast disease under disease conducive upland nursery at Regional Agricultural Research Station (RARS), Khajura, Banke, Nepal during July to November, 2016. A total of 101 rice genotypes (comprising of local, improved and hybrid) including resistant and susceptible check were screened in a randomized complete block design with two replications. Disease scoring was done beginning from the 20th days of sowing by using the disease rating scale 0-9. Amongst the tested 101 rice genotypes, 28 genotypes were found resistant, 15 genotypes were moderately resistant, 16 genotypes were moderately susceptible, 39 genotypes were susceptible and 3 genotypes were highly susceptible to leaf blast. The information revealed from this study could be helpful for rice leaf blast disease management and utilizing these resistant and moderately resistant genotypes for further resistance breeding program.

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Qin, Junhao, Hongzhi He, Shiming Luo, and Huashou Li. "Effects of rice-water chestnut intercropping on rice sheath blight and rice blast diseases." Crop Protection 43 (January 2013): 89–93. http://dx.doi.org/10.1016/j.cropro.2012.09.009.

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Wicaksono, Danar, Arif Wibowo, and Ani Widiastuti. "METODE ISOLASI PYRICULARIA ORYZAE PENYEBAB PENYAKIT BLAS PADI." JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA 17, no. 1 (May 3, 2017): 62. http://dx.doi.org/10.23960/j.hptt.11762-69.

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Isolation method of Pyricularia oryzae the causal agent of rice blast disease. Rice blast disease is a disease that reduces rice productivity and threatens global food reserves. The study of diversity and distribution of race fungal causing rice blast disease required a fungal isolates collection from different places and times. One of the challenges in collecting these fungi is the difficulty of isolation process. The purpose of this research was to study the proper isolation method of rice blast pathogen. The most appropriate isolation method of Pyricularia oryzae was to moisten the infected panicle, place on moist filter paper in a petri dish, and incubate plate for 2 days at room temperature under fluorescent lamp. Afterward, conidium was picked using sterile needle and transfered to potato dextrose agar without lactic acid.

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Bragina, Olesya, Andrey Ogly, and Pshimaf Khachmamuk. "Immunological variability of rice varieties depending on growing conditions." E3S Web of Conferences 285 (2021): 02036. http://dx.doi.org/10.1051/e3sconf/202128502036.

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Blast (causative agent Pyriculariaoryzae Cavara) plays an important role among economically important, dangerous and harmful rice diseases of rice in all rice-growing countries, including Russia. The problem of resistance of rice plants to disease is one of the main problems in modern breeding in most countries. Intensification of rice cultivation creates a favorable microclimate in the sowing agrocenosis for the development of blast disease and leads to an increase in its harmfulness. The varieties quickly lose their resistance to new races of the pathogen, due to high spontaneous variability of the M. grisea fungus, its field populations are usually represented by a mixture of races with different virulence and aggressiveness, outstripping the evolution of the host plant. The nature of the blast manifestation depends on the agroclimatic conditions and genotype. The article presents the results of research at experimental and production plots of Federal Scientific Rice Centre (FSC of Rice) and Elite Seed-Production Experimental Statation Krasnaya (ESPES Krasnaya). It has been shown that a clear differentiation of rice varieties in terms of blast resistance and yielding properties is possible only when certain (provocative) conditions are created that contribute to the manifestation of their genetic potential, while the blast resistance of varieties cannot be provided only by the introduction of one gene of racespecific resistance. A close negative relationship was obtained between the yield and the intensity of blast disease on two backgrounds of mineral nutrition: N-1 - r = -0.93; N-2 - r = -0.95. The determination coefficients showed that in 86.8 - 90.1% of cases, the yield is due to the intensity ofblast development on the crops of the studied rice varieties.

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Wei, Yi, Lanhui Li, Wenjun Hu, Huiyan Ju, Mingzhe Zhang, Qingming Qin, Shihong Zhang, and Guihua Li. "Suppression of Rice Blast by Bacterial Strains Isolated from Cultivated Soda Saline-Sodic Soils." International Journal of Environmental Research and Public Health 17, no. 14 (July 21, 2020): 5248. http://dx.doi.org/10.3390/ijerph17145248.

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Rice blast caused by Magnaporthe oryzae is one of the most serious rice diseases worldwide. Biological control is gaining popularity as a promising method for the control of this disease; however, more effective microbial strains with strong adaptability in rice fields need to be identified. Here, we report for the first time the successful identification of biocontrol bacterial strains from frozen soils of the soda saline-sodic land. We isolated 82 bacterial strains from rice fields in the western Songnen Plain of China, one of the three major soda saline soils in the world. Five of the isolated strains exhibited strong inhibition to M. oryzae growth. The potential strains were identified as Bacillus safensis JLS5, Pseudomonas koreensis JLS8, Pseudomonas saponiphila JLS10, Stenotrophomonas rhizophila JLS11 and Bacillus tequilensis JLS12, respectively, by 16s RNA gene sequence analysis. The antagonistic assay and the artificial inoculation tests showed that JLS5 and JLS12 could effectively inhibit conidial germination and pathogenicity of the rice blast fungus, both preventively and curatively. The suppression of pathogenicity was further confirmed by greenhouse experiments, showing the effectiveness of JLS5 and JLS12 as a potential biological control agents of M. oryzae. The potential application of these cold-tolerant strains for rice blast control in cold regions is discussed. Our data suggest that soda saline-sodic soils are a rich source for biocontrol strain isolation.

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Chen, Wen-Ching, Tai-Ying Chiou, Aileen L. Delgado, and Chien-Sen Liao. "The Control of Rice Blast Disease by the Novel Biofungicide Formulations." Sustainability 11, no. 12 (June 23, 2019): 3449. http://dx.doi.org/10.3390/su11123449.

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The study aims to develop novel biofungicide formulations against rice blast disease. A total of 300 rhizobacteria strains were isolated from rice field soil and were examined for the inhibition of Magnaporthe oryzae growth in a vitro test. Among them, only six rhizobacteria showed inhibition against M. oryzae. The three strains that showed the highest inhibition were Bacillus subtilis 5, B. cereus 3S5, and Pseudomonas fluorecens 10S2. A rice hull mixture and liquid medium were mixed with the above-mentioned bacterial suspensions into three bacterial formulas and tested separately on the rice cultivar UPLRi-5 after infection by M. oryzae under a controlled condition. The three novel biofungicide formulas significantly inhibited rice blast disease intensity with a mean disease control rate being approximately 31% higher than the control. The formulas proved to be effective and should be considered as promising novel treatments for rice blast disease.

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Zarbafi, Seyedeh Soheila, and Jong Hyun Ham. "An Overview of Rice QTLs Associated with Disease Resistance to Three Major Rice Diseases: Blast, Sheath Blight, and Bacterial Panicle Blight." Agronomy 9, no. 4 (April 6, 2019): 177. http://dx.doi.org/10.3390/agronomy9040177.

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Rice (Oryza sativa L.) is one of the most important crops that are produced as human food, directly feeding people more than any other crop. Hence, it is important to increase the yield potential of rice through improving the disease resistance to prevailing rice diseases. Blast caused by the fungus Magnaporthe oryzae, sheath blight caused by the fungus Rhizoctonia solani Kühn, and bacterial panicle blight caused by the bacteria Burkholderia glumae and B. gladioli are serious rice diseases in many rice-producing regions. In spite of the chronic damages from these major diseases, the quantitative resistance to each of them is not known very well and any available disease-resistant varieties are rare or not stable. Although gene-for-gene resistance that is mediated by an R-Avr interaction has been intensively studied for blast, quantitative (or horizontal) resistance to a broad spectrum of races in M. oryzae is still poorly understood. Identification of the quantitative trait loci (QTLs) related to these diseases and using marker technology can facilitate marker-assisted selection to screen resistant traits in individual resources, which could ultimately lead to the development of novel disease-resistant rice varieties. This article is a summary of identified QTLs that are associated with rice diseases, including blast, sheath blight, and bacterial panicle blight that can be used in breeding programs.

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Greer, C. A., and R. K. Webster. "Occurrence, Distribution, Epidemiology, Cultivar Reaction, and Management of Rice Blast Disease in California." Plant Disease 85, no. 10 (October 2001): 1096–102. http://dx.doi.org/10.1094/pdis.2001.85.10.1096.

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Rice blast, caused by Pyricularia grisea, was first found in California in 1996. Disease surveys have shown the blast disease is spreading at a moderate rate in California rice fields. Although no effective major resistance genes are known to occur in widely grown commercial California cultivars, there appear to be differences among the cultivars with respect to field susceptibility to the pathogen. P. grisea was recovered from rice crop residue and commercial seedlots which are suggested as possible sources of initial P. grisea inoculum in California rice fields. Examination of weather data indicates that environmental conditions in California rice-producing areas are permissive for rice blast but generally not optimal for epidemic development. Spore trapping determined that the majority of P. grisea conidia are generally not released until approximately 6:00 A.M. and would not have sufficient time for infection before leaf wetness periods end. Azoxystrobin showed positive results with respect to reduction of neck blast incidence and yield increases in small-plot and large-scale fungicide trials.

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Nugroho, Cipto, Didik Raharjo, Muhammad Alwi Mustaha, and Muhammad Asaad. "Assessing disease severity of rice blast under different rates of nitrogen fertilizer and planting system." E3S Web of Conferences 306 (2021): 01034. http://dx.doi.org/10.1051/e3sconf/202130601034.

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The study aimed to determine the effect of nitrogen rates and planting systems on the incidence and severity of rice blast under naturally infected rice plants and their relationship to rice yield performance. Recommended nitrogen rate for both direct seeding was 93.2kg/ha. Treatments consisted of 75% recommended-N rate, 100% recommended-N rate, 150% recommended-N, and existing farmer’s practice. Treatments were applied in a three-way splitted-N application at 14, 30, and 45 days after planting, respectively. The results indicate that rates of N fertilization affected disease incidence of the rice blast where the low-N application was generally lower than recommended-N rate, high-N rate, and farmer’s practice, both on jajar legowo 2:1 and broadcasted direct seeding. This study revealed that recommended-N application, although has a higher disease incidence than low-N application, could tolerate yield loss due to rice blast by producing more productive tillers, number of grains per panicle, and reducing the number of unfilled grains. This study generally showed that jajar legowo 2:1 direct seeding gave lower disease incidence and severity to the rice blast than broadcasted direct seeding. The study suggested an appropriate recommended-N rate and jajar legowo 2:1 direct seeding (double row) was incorporated into the rice blast management strategies.

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Ma, Jianbing, M. H. Jia, and Y. Jia. "Characterization of Rice Blast Resistance Gene Pi61(t) in Rice Germplasm." Plant Disease 98, no. 9 (September 2014): 1200–1204. http://dx.doi.org/10.1094/pdis-09-13-1014-re.

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Identification of resistance (R) genes to races of Magnaporthe oryzae in rice (Oryza sativa) germplasm is essential for the development of rice cultivars with long-lasting blast resistance. In the present study, one major quantitative trait locus, qPi93-3, was fine mapped using a recombinant inbred line (RIL), F8 RIL171, derived from the cross between ‘Nipponbare’ and ‘93-11’. RIL171 contained a heterozygous qPi93-3 allele which was found to be resistant against nine U.S. common races—ID1, IA1, IB49, IE1, IA45, IB1, IC17, IB45, and IH1—of M. oryzae. An F2 mapping population consisting of 2,381 individuals derived from RIL171 was evaluated with a field isolate (race) ARB82 (IA1) of M. oryzae under greenhouse conditions. Disease reaction of a resistant/susceptible ratio of 3:1 was identified with F2:F3 families. In total, 12 simple sequence repeat markers spanning qPi93-3 were used for fine mapping. Consequently, qPi93-3 was delimited to 4.2 Mb between RM3246 and RM7102. Three insertion-deletion (InDel) markers located between RM3246 and RM7102, that had previously used to map Pi61(t), showed that qPi93-3 was Pi61(t). The existence of Pi61(t) in 136 rice germplasm lines from the United States Department of Agriculture rice core collection was evaluated using Pi61(t)-specific InDel markers. Pi61(t) was identified as a source of resistance in 5 of the 136 lines. The characterized germplasm will be useful for rice breeders to use for improving blast resistance.

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Yokotani, Naoki, Tomoko Tsuchida-Mayama, Hiroaki Ichikawa, Nobutaka Mitsuda, Masaru Ohme-Takagi, Hisatoshi Kaku, Eiichi Minami, and Yoko Nishizawa. "OsNAC111, a Blast Disease–Responsive Transcription Factor in Rice, Positively Regulates the Expression of Defense-Related Genes." Molecular Plant-Microbe Interactions® 27, no. 10 (October 2014): 1027–34. http://dx.doi.org/10.1094/mpmi-03-14-0065-r.

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Plants respond to pathogen attack by transcriptionally regulating defense-related genes via various types of transcription factors. We identified a transcription factor in rice, OsNAC111, belonging to the TERN subgroup of the NAC family that was transcriptionally upregulated after rice blast fungus (Magnaporthe oryzae) inoculation. OsNAC111 was localized in the nucleus of rice cells and had transcriptional activation activity in yeast and rice cells. Transgenic rice plants overexpressing OsNAC111 showed increased resistance to the rice blast fungus. In OsNAC111-overexpressing plants, the expression of several defense-related genes, including pathogenesis-related (PR) genes, was constitutively high compared with the control. These genes all showed blast disease-responsive expression in leaves. Among them, two chitinase genes and one β-1,3-glucanase gene showed reduced expression in transgenic rice plants in which OsNAC111 function was suppressed by a chimeric repressor (OsNAC111-SRDX). OsNAC111 activated transcription from the promoters of the chitinase and β-1,3-glucanase genes in rice cells. In addition, brown pigmentation at the infection sites, a defense response of rice cells to the blast fungus, was lowered in OsNAC111-SRDX plants at the early infection stage. These results indicate that OsNAC111 positively regulates the expression of a specific set of PR genes in the disease response and contributes to disease resistance.

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Journal articles on the topic 'Rice Rice blast disease'

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