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Dissertations / Theses on the topic 'Pest control; Field crops'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Karamaouna, Filitsa. "Biology of the parasitoids Leptomastix epona (Walker) and Pseudaphycus flavidulus (Brethes) and behavioural interactions with the host mealybug Pseudococcus viburni (Signoret)." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313812.

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2

Brichler, Kirsten Nicole. "Effects of Farm Management Practices on Pest Slugs and Slug Predators in Field Crops." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98469.

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Mid-Atlantic crop producers are increasingly transitioning to soil conservation methods that include reducing or eliminating tillage and planting high residue cover crops. These practices are associated with an increase in moderate to severe damage to field crops by slugs. Conserving, and even enhancing, natural enemy populations is a desirable way to manage slug infestations because remedial control measures are limited. To better understand how cover crop usage and tillage practices affect slug and natural enemy populations, 43 Virginia fields with different combinations of tillage practices

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3

Walker, Anthony John. "Characterisation of the proteolytic activity in the digestive system of the field slug Deroceras reticulatum as a target for novel methods of control." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360995.

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4

Krimmer, Elena [Verfasser], Ingolf [Gutachter] Steffan-Dewenter, and Martin [Gutachter] Entling. "Agri-environment schemes and ecosystem services: The influence of different sown flower field characteristics on pollination, natural pest control and crop yield / Elena Krimmer ; Gutachter: Ingolf Steffan-Dewenter, Martin Entling." Würzburg : Universität Würzburg, 2021. http://d-nb.info/1234912449/34.

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5

Öberg, Sandra. "Spiders in the agricultural landscape : diversity, recolonisation, and body condition /." Uppsala : Dept. of Ecology, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200725.pdf.

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6

Smith, Caroline Louise. "Biological control of root-knot nematodes (Meloidogyne spp.) with Pasteuria penetrans and Verticillium chlamydosporium in Costa Rica." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297317.

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7

Morse, Stephen. "The integration of partial plant resistance with biological control by an indigenous natural enemy complex in affecting populations of cowpea aphid (Aphis craccivora Koch)." Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237839.

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8

George, David R. "Quantitative application of trap plants for pest control in field vegetables." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440578.

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9

Taylor, Sharyn Patricia. "The root lesion nematode, Pratylenchus neglectus, in field crops in South Australia." Title page, contents and summary only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09pht2462.pdf.

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Includes bibliographical references (leaves 241-25). Aims to evaluate sampling procedures; assess the extent and magnitude of yield loss caused by Pratylenchus neglectus; assess the population dynamics of Pratylenchus neglectus in cereals; determine whether resistance occurs in field crops; and, assess whether variation occurs between geographically isolated species of Pratylenchus neglectus

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10

Bogahawatte, Chitra N. L. "Glasshouse and field studies of diamondback moth Plutella xylostella (Lepidoptera: Yponomeutidae) on host plant resistance in Brassica and biological control." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259920.

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11

Harwood, Robert William John. "The management of arable field margins to enhance natural populations of beneficial arthropods." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307086.

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12

Jenkins, Nina E. "Studies on mass production and field efficacy of Metarhizium flavoviride for biological control of locusts and grasshoppers." Thesis, Cranfield University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309694.

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13

Daudi, Andrew Timothy. "Pasteuria pentrans as a biocontrol agent of Meloidogyne species and its field evaluation in Malawi." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293711.

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14

Bell, Howard A. "The tritrophic interactions between a pest noctuid, beneficial biological control agents and genetically modified crops expressing anti-insect genes." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250188.

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15

Howling, Gavin G. "The foraging and feeding behaviour of pest slugs with reference to control in the field." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335864.

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16

Pretorius, Danielle. "Antimicrobial lipopeptide production by Bacillus spp. for post-harvest biocontrol." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96117.

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Thesis (MEng) -- Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: As overpopulation threatens the world’s ability to feed itself, food has become an invaluable resource. Unfortunately, almost a third of the food produced for human consumption is lost annually. Pests including insects, phytopathogens and weeds are responsible for more than a third of the annual major crop losses suffered around the world. The majority of current post-harvest control strategies employ synthetic agents. These compounds, however, have been found to be detrimental to the environment as well as human health, whi

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17

Heystek, Fritz. "Laboratory and field host utilization by established biological control agents of Lantana camara L. in South Africa." Thesis, Rhodes University, 2006. http://eprints.ru.ac.za/255/.

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18

Harbi, Ahlem. "Diachasmimorpha longicaudata as Biological Control agent of the Mediterranean fruit fly, Ceratitis capitata: biotic and abiotic factors affecting its implementation in citrus crops of the Mediterranean basin." Doctoral thesis, Universitat Jaume I, 2017. http://hdl.handle.net/10803/401930.

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Ceratitis capitata Wiedemann (Diptera: Tephritidae) is a cosmopolitan pest, originary from West-Africa, that has invaded almost all the temperate and tropical countries by the unwanted aid of the men. During its adaptation to these new environments, C. capitata has widened its host plant portfolio, being nowadays a key pest for more than 400 plant species of economic importance. Due to this importance, many importing countries had established quarantine measures and borders against fruit world-wide trade, which had directly impacted on the plant protection policies of producer countries. Spa

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19

Samson, Roger A. (Roger Anthony). "On-farm evaluation of cultivation, cover crops and chemical banding for crop and weed management in integrated farming systems." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55700.

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20

Kazachkova, Nadiya. "Genotype analysis and studies of pyrethroid resistance of the oilseed rape (Brassica napus) insect pest - pollen beetle (Meligethes aeneus) /." Uppsala : Department of Plant Biology and Forest Genetics, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200711.pdf.

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21

Ratnasoma, H. A. "Studies on the use of Pasteuria penetrans for control of root-knot nematodes and its field evaluation on perennial crops in Sri Lanka." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253457.

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22

Gumede, Halalisani. "The development of a putative microbial product for use in crop production." Thesis, Rhodes University, 2008. http://eprints.ru.ac.za/1352/.

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23

Khalghani, Jafar. "The interaction of host plant resistance to cereal aphids with biological and chemical control methods with respect to integrated pest management : field and laboratory studies." Thesis, University of Newcastle Upon Tyne, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240855.

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24

Bradley, Lucy, and Roberta Gibson. "Cricket Management." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/144782.

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2 pp.<br>Indian house crickets and field crickets are the two most common crickets in Arizona. Although these crickets do not bite or carry diseases, they are considered a nuisance because of their "chirping". This publication focuses on common crickets found in Arizona, including the Indian house crickets, field crickets, and Jerusalem crickets. It also discusses the problems they cause and the strategies to control them.

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25

RAGA, ADALTON. "Incidencia de moscas-das-frutas em cafe e citros e tratamento quarentenario de frutos citricos com radiacao gama." reponame:Repositório Institucional do IPEN, 1996. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10484.

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Made available in DSpace on 2014-10-09T12:40:59Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:57:32Z (GMT). No. of bitstreams: 1 04015.pdf: 1118706 bytes, checksum: cfb96bf2d7bcbe122082fa953b52e435 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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26

Arcaya, Evelin. "Bionomía, diversidad y morfología preimaginal de sírfidos depredadores (Diptera: Syrphidae) en el Estado Lara, Venezuela. Importancia en el control biológico de plagas." Doctoral thesis, Universidad de Alicante, 2012. http://hdl.handle.net/10045/26778.

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Este estudio constituye una importante fuente de información sobre el potencial de los sírfidos depredadores (Diptera: Syrphidae, Syrphinae) como agentes biológicos para el control de plagas en cultivos agrícolas en Venezuela. Las larvas de los Syrphidae presentan una morfología muy variada y poseen una gran diversidad de modos de vida. La mayor parte de los representantes de la subfamilia Syrphinae, son depredadores de una amplia gama de hemípteros de cuerpo blando aunque también pueden alimentarse de otros artrópodos. Las principales presas de los sírfidos depredadores son los áfidos o pulgo

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27

POTENZA, MARCOS R. "Avaliacao de produtos naturais irradiados para o controle de Sitophilus zeamais Mots. (Coleoptera: Curculionidae) e Blattella germanica (L.) (Dictyoptera: Blattellidae)." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11146.

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Made available in DSpace on 2014-10-09T12:48:53Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:00:58Z (GMT). No. of bitstreams: 1 09622.pdf: 5768165 bytes, checksum: e2892f39925cad85d839fbede925fbad (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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28

N'Doye, M'Baye. "Biologie et ecologie de deux lepidopteres amsacta moloneyi druce (lepidoptera, arctiidae) et heliocheilus albipunctella (de joannis) (lepidopt. , noctuid. ) ravageurs du mil au senegal." Toulouse 3, 1988. http://www.theses.fr/1988TOU30173.

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A. M. Et h. A. Sont 2 ravageurs-cles du mil au senegal. Leur cycle biologique est etudie dans la nature et au laboratoire. La nymphe entre en diapause pendant la saison seche (octobre a juillet). Les larves de h. A. Sont infeodees a l'epi de mil, celles d'a. M. Le sont au feuillage. L'inventaire des parasites est dresse, et la biologie des principaux est etudiee. Etude de la dynamique des populations dans le nord et le sud du senegal. Les facteurs regulateurs (pluie, temperature, photoperiode, cycle lunaire) sont analyses. Il existe 3 vols dans la nature pour a. M. , 1 seul pour h. A.

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29

Coombes, Candice Anne. "Field evaluation of the use of select entomopathogenic fungal isolates as microbial control agents of the soil-dwelling life stages of a key South African citrus pest, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae)." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/507.

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The control of false codling moth (FCM), Thaumatotibia leucotreta (Meyrick, 1912) (Lepidoptera: Tortricidae), in citrus orchards is strongly reliant on the use of integrated pest management as key export markets impose stringent chemical restrictions on exported fruit and have a strict no entry policy towards this phytosanitary pest. Most current, registered control methods target the above-ground life stages of FCM, not the soil-dwelling life stages. As such, entomopathogenic fungi which are ubiquitous, percutaneously infective soil-borne microbes that have been used successfully as control a

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30

Kean, J. M. "Metapopulation theory in practice." Lincoln University, 1999. http://hdl.handle.net/10182/1372.

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A metapopulation is defined as a set of potential local populations among which dispersal may occur. Metapopulation theory has grown rapidly in recent years, but much has focused on the mathematical properties of metapopulations rather than their relevance to real systems. Indeed, barring some notable exceptions, metapopulation theory remains largely untested in the field. This thesis investigates the importance of metapopulation structure in the ‘real world’, firstly by building additional realism into metapopulation models, and secondly through a 3-year field study of a real metapopulation s

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31

Robinson, K. A. "Use of floral resources by the lacewing Micromus tasmaniae and its parasitoid Anacharis zealandica, and the consequences for biological control by M. tasmaniae." Diss., Lincoln University, 2009. http://hdl.handle.net/10182/823.

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Arthropod species that have the potential to damage crops are food resources for communities of predators and parasitoids. From an agronomic perspective these species are pests and biocontrol agents respectively, and the relationships between them can be important determinants of crop yield and quality. The impact of biocontrol agents on pest populations may depend on the availability of other food resources in the agroecosystem. A scarcity of such resources may limit biological control and altering agroecosystem management to alleviate this limitation could contribute to pest management. This

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32

Laubertie, Elsa. "The role of resource subsidies in enhancing biological control of aphids by hoverflies (Diptera: Syrphidae)." Diss., Lincoln University, 2007. http://hdl.handle.net/10182/984.

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In this thesis, experiments were conducted in the laboratory and the field to determine whether the provision of floral resources to hoverflies could enhance the biological control of aphids. The overall aim was to clarify hoverfly behaviour and ecology in an agroecosystem in order to understand the potential of these insects for biocontrol under a conservation biological control (CBC) regime. A preliminary experiment in New Zealand compared the effect of different coloured water-traps on catches of the hoverflies Melanostoma fasciatum (Macquart) and Melangyna novaezelandiae (Macquart). Signif

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33

Merfield, C. N. "Predator interactions within a trophic level : Phalangium opilio L. (Arachnida: Opiliones) and mites (Arachnida: Acari)." Diss., Lincoln University, 2000. http://hdl.handle.net/10182/21.

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This study investigated commensal feeding interactions between the European harvestman (P. opilio L.) and the predatory mites Balaustium spp. and Anystis baccarum L. It also investigated the feeding behaviour of P. opilio. Experiments were conducted in the laboratory using standardised temperature, humidity, photoperiod and experimental arenas, with eggs of the brown blowfly (Calliphora stygia F.) as prey facsimiles. Due to initial difficulties in obtaining enough predatory mites, mite feeding was manually simulated piercing blowfly eggs with a minuten pin. P. opilio consumed significantly mor

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34

Yamoah, Emmanuel. "A model system using insects to vector Fusarium tumidum for biological control of gorse (Ulex europaeus)." Phd thesis, Lincoln University. Bio-Protection and Ecology Division, 2007. http://theses.lincoln.ac.nz/public/adt-NZLIU20080131.114607/.

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The overall objective of this study was to test the hypothesis that insects can vector F. tumidum conidia to infect gorse plants with the aim of developing an alternative approach to mycoherbicide delivery to control weeds. Four potential insect species (Apion ulicis, Cydia ulicetana, Epiphyas postvittana and Sericothrips staphylinus) were assessed for their ability to vector F. tumidum conidia. To achieve this, the external microflora (bacteria and fungi) and the size and location of fungal spores on the cuticle of these insect species were determined. In addition, the ability of the insects

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35

Dickson, Ross L. "The effect of water stress, nitrogen and gibberellic acid on the phytotoxicity of post-emergent herbicides to Avena spp." Lincoln University, 1990. http://hdl.handle.net/10182/1283.

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A series of experiments was carried out on cultivated oat (Avena sativa L. cv Amuri) to examine the efficacies of fluazifop-butyl and glyphosate against water stressed plants, plants grown in low and high nitrogen and plants treated with gibberellic acid (GA₃). Avena sativa L. was used as a test plant and on completion of the experiments, further studies were carried out on the weed species wild oat (Avena fatua L.). In the laboratory, plants maintained at wilting point for five days before and nine days after spraying and treated with fluazifop-butyl (0.5 kg a.i./ha) appeared healthy 32 days

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36

Berndt, Lisa A. "The effect of floral resources on the leafroller (Lepidoptera: Tortricidae) parasitoid Dolichogenidea tasmanica (Cameron)(Hymenoptera: Braconidae) in selected New Zealand vineyards." Lincoln University, 2002. http://hdl.handle.net/10182/1045.

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In this study, buckwheat (Fagopyrum esculentum Moench) and alyssum (Lobularia maritima (L.)) flowers were used to examine the effect of floral resources on the efficacy of the leafroller parasitoid Dolichogenidea tasmanica (Cameron) in vineyards. This was done by assessing the influence of these flowers on parasitoid abundance and parasitism rate, and by investigating the consequences of this for leafroller abundance. In laboratory experiments, alyssum flowers were used to investigate the effect of floral food on the longevity, fecundity and sex ratio of D. tasmanica. Dolichogenidea tasmanica

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37

Meiss, Helmut. "Diversifying crop rotations with temporary grasslands : potentials for weed mangement and farmland biodiversity." Phd thesis, Université de Bourgogne, 2010. http://tel.archives-ouvertes.fr/tel-00575607.

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Crop rotation may be used to prevent the continuous selection of particular weed species adapted to one crop type. This might be useful for weed management, economy in herbicide applications and promoting biodiversity. Common simple crop sequences might be diversified by introducing perennial forage crops. Impacts of such perennial crops on weeds were studied with four approaches : 1) Large-scale weed surveys in 632 fields in western France showed that weed species composition differed most strongly between perennial alfalfa crops and annual crops. Comparisons of fields before, during and afte

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38

Vankosky, Meghan Ann. "Integrated pest management of Sitona lineatus L. (Coleoptera: Curculionidae) in crops of Pisum sativum L. (Fabales: Fabaceae) in Western Canada." Master's thesis, 2010. http://hdl.handle.net/10048/1317.

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Sitona lineatus L. (Coleoptera: Curculionidae) is a pest of Pisum sativum L. (Fabales: Fabaceae) and managing it is a challenge because of its fecundity, migratory behavior and concealed larval habitat. Potential components of an integrated pest management program for S. lineatus were investigated near Lethbridge and Vauxhall, Alberta over three years. Cage studies indicated that larval feeding is more damaging than adult feeding but that larval populations are not dependent on adult weevil density. In open plot experiments, thiamethoxam-treated plants experienced significantly less foliar fee

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39

Bosem, Aliette. "Landscape heterogeneity affects arthropod functional diversity and biological pest control." Thesis, 2017. http://hdl.handle.net/11858/00-1735-0000-0023-3FA5-4.

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40

Gatarayiha, Mutimura Celestin. "Biological control of the two-spotted spider mite, Tetranychus urticae Koch (Acari : tetranychidae)." Thesis, 2009. http://hdl.handle.net/10413/650.

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The two-spotted spider mite (TSM), Tetranychus urticae Koch, is an important pest of many greenhouse and field crops worldwide. The development of resistance in TSM populations to chemical acaricides, allied with public health concerns about pesticide residues, has motivated the search for alternative control measures to suppress the pest. Hyphomycetous fungi are promising agents for mite control and the fungus Beauveria bassiana (Bb) (Balsamo) Vuillemin was investigated in this study as a biocontrol agent. The principal objectives of this study comprised: a) screening Bb strains for their pat

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41

Krimmer, Elena. "Agri-environment schemes and ecosystem services: The influence of different sown flower field characteristics on pollination, natural pest control and crop yield." Doctoral thesis, 2021. https://doi.org/10.25972/OPUS-20657.

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Insects are responsible for the major part of the ecosystem services pollination and natural pest control. If insects decline, these ecosystem services can not longer be reliably delivered. Agricultural intensification and the subsequent loss and fragmentation of habitats has among others been identified to cause insect decline. Ecological intensification aims to promote alternative and sustainable management practices in agricultural farming, for example to decrease the use of external inputs such as pesticides. Agri-environment schemes make amends for farmers if they integrate ecologically b

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42

Lai, Yuchi, and 賴育祺. "Vegetable Crops Pest Control with Non-pesticide Materials." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/49642110657190360340.

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碩士<br>大葉大學<br>生物產業科技學系<br>100<br>Synthetic chemicals have been used extensively in agriculture, excessive use causes serious problem of toxic residues, resistance and ecological damage. Therefore, traditional agriculture faces serious problems. As the concept of using less pesticide becoming increasingly popular in recent years People pay more attention to environmental problem and macrobiotic diet. Recently farmers gradually were transiting from chemical pesticides to natural organic which were safer and more efficient. Non-pesticides materials were need to screen whether they have pest contr

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43

Tsou, Ruen Hao, and 鄒潤豪. "Pest Control of Vegetable Crops with Stellera Chamaejasme Extract." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/10830432080842368298.

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碩士<br>大葉大學<br>生物產業科技學系<br>100<br>ABSTRACT Stellera chamaejasme L. was a genus of Thymelaeaceae Stelleralinn Plant., and it was one poisonous plant that be stamped on the meadow. Stellera chamaejasme L. was used for the treatment of edema, sputum, relieve pain, anti-Pest control, but it was one poisonous plant to be used rarely. In this study, Stellera chamaejasme L. was extracted with different alcohols solvent by heating reflux extraction. The content of total flavonoids were analyzed, and we used the spectrophotometer for quantitative analysis. On the pest control of vegetable crops with st

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44

CHENG, HSU-PING, and 鄭旭萍. "Review of Pest Control by Using Sex Pheromones for Genetically Modified Crops." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ybkgy5.

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碩士<br>朝陽科技大學<br>應用化學系<br>106<br>Due to the long time use of a large number of pesticides to prevent pests, land and environment has caused seriously damage and pollution. In this study shows recent situations of pest control on genetically modified crops like soybeans, cotton, and corn, also examples of using pheromones for pest control. We can easily find out the pheromones can effectively control the pest just like pesticides. The pheromone is harmless and non-toxic to the environment even in a small amount. It seems to be much more economical and friendly to the ecological. Continuous res

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45

Lin, Ming-Jang, and 林銘璋. "Study on the Control of Pest Snail Pomacea canaliculata in Paddy field by thuringiensin containing fermentation broth from Bacillus thurngiensis." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/5vh5s4.

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碩士<br>朝陽科技大學<br>應用化學系碩士班<br>94<br>The purpose of the study is to test the thuringiensin (β-exotoxin) from Bacillus thuringiensis for controlling Pest Snail Pomacea canaliculata. Experiments were carried out both in the laboratory and in paddy field. The laboratory test started in 2003, the 29 x 38 cm plastic basins with 10 cm high of soil and 3 cm deep of water were used to imitate paddy field. The compositions of application of thuringiensin containing fermentation broth of Bacillus thuringiensis were 50, 100, 200, 300, 400 ppm with 3 replicates. Paddy field test started in 2005, areas of 3 m

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46

Moloto, Kholofelo Caroline. "Evaluation of F3 segregation cowpea (Vigna unguiculata) population developed from insect-mediated crosses." Thesis, 2019. http://hdl.handle.net/10386/2948.

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Thesis (M.Sc. Agriculture (Agronomy) -- University of Limpopo, 2019<br>Erratic rainfall and insect infestation are some of the factors that limit cowpea production in Limpopo (Asiwe, 2009). Improved cowpea varieties available for dryland production in Limpopo do not meet the farmer’s needs. Specific trait crosses are needed to be made with adapted varieties for the purpose of developing high yielding, pest tolerant and adapted varieties. Varieties with desired specific traits were planted in isolation plots for outcrossing by insects. F1 lines derived from parental lines that were half sib see

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(6632369), Jodi E. Boe. "Establishing the Value of ALS-Inhibiting Herbicides in Fields with Confirmed Weed Resistance to ALS-Inhibiting Herbicides." Thesis, 2019.

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<p>Acetolactate synthase (ALS) inhibitors are a widely used class of selective herbicides used to control grass and broadleaf weeds. The repeated use of ALS-inhibiting herbicides has selected for biotypes of weeds resistant to ALS inhibitors, especially in the weeds most problematic to growers in the Midwest. While ALS inhibitor use seems futile, new mechanisms of herbicide action are not predicted to be commercialized in the near future to solve this problem. This leads to the main objective of this research, determining what value ALS inhibitors provide in controlling populations of weeds wi

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(9224231), Dongdong Ma. "Ameliorating Environmental Effects on Hyperspectral Images for Improved Phenotyping in Greenhouse and Field Conditions." Thesis, 2020.

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Hyperspectral imaging has become one of the most popular technologies in plant phenotyping because it can efficiently and accurately predict numerous plant physiological features such as plant biomass, leaf moisture content, and chlorophyll content. Various hyperspectral imaging systems have been deployed in both greenhouse and field phenotyping activities. However, the hyperspectral imaging quality is severely affected by the continuously changing environmental conditions such as cloud cover, temperature and wind speed that induce noise in plant spectral data. Eliminating these environmental

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Hänke, Sebastian. "Local and landscape management effects on syrphid fly guilds: flower strips, farming practice and hedges." Doctoral thesis, 2012. http://hdl.handle.net/11858/00-1735-0000-000E-0102-F.

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Während der letzten Jahrzehnte hat sich die Landwirtschaft grundlegend verändert und wird heute zunehmend von hocheffektiven, wirtschaftlich optimierten Produktionssystemen mit ausgedehnten Anbauflächen und dem damit verbundenen gesteigertem Einsatz von Kunstdüngern und Pestiziden geprägt. Diese Entwicklung bedingt jedoch auch den Verlust und die Fragmentierung von naturnahen Habitaten mit negativen Auswirkungen auf die Artenvielfalt in intensiv genutzten landwirtschaftlichen Gebieten. Der Rückgang der Artenvielfalt führt zur Schwächung von Ökosystemfunktionen wie der biologischen Schädlingsko

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Maas, Bea. "Birds, bats and arthropods in tropical agroforestry landscapes: Functional diversity, multitrophic interactions and crop yield." Doctoral thesis, 2013. http://hdl.handle.net/11858/00-1735-0000-0022-5E77-5.

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