Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"insect resistance"”.
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Modeling insect resistance to transgenic corn and cowpea
… crops covered over 66 million hectares in 2011. Insect resistance management (IRM) is implemented to protect the efficacy of commercial transgenic crops expressing Bacillus thuringiensis toxins because the benefits of the pest susceptibility to Bt toxins is considered as a common good. Simulation …
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The investigation of a novel proteinase inhibitor as a means to transfer insect resistance to plants
… the most important being the bionomics of insect pests; monitoring systems to establish the prevalence and seasonal occurrence of insect pests; calculation of economic thresholds; the biology of parasites and predators; utilisation of insect resistant plant varieties; and methods to …
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A Study of Neonicotinoid Seed Treatments in Bt Maize: Insect Resistance Management, Efficacy, and Environmental Fate
… maize, Zea mays L. (Poaceae), that produces insecticidal toxins by way of genes derived from Bacillus thuringiensis (Bt), occupies more than 75% of maize acreage. Among a variety of secondary pests targeted by NSTs, the primary soil-dwelling pest targeted by Bt maize is the western corn …
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Evolution of Bacillus thuringiensis Maize Yields in South Africa
… following reports of Busseola fusca developing resistance to Bacillus thuringiensis (Bt) maize in South Africa in 2006. This study uses empirical data to estimate the potential impact of insect resistance on yields and estimates the economic and food availability impacts of genetic deterioration …
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The determination of log-time mortality curves of the various life stages of (Hypera postica) subjected to certain insecticides
… purpose of this investigation was to test three insecticides on all the life stages of the alfalfa weevil. The objectives were to obtain information on the toxicity of certain insecticides on the alfalfa weevil in the laboratory, to establish standard susceptibility curves of the life stages of …
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Inheritance, fitness costs, and potential mechanisms of resistance for western corn rootworm larvae surviving Bt corn
… virgifera virgifera LeConte, has developed resistance to most control tactics used to manage it. Transgenic corn varieties that express insecticidal proteins from the bacterium Bacillus thuringiensis Berliner (Bt), cause mortality to target pests when ingested. In an attempt to delay …
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Influence of Acremonium coenophialum on Festuca arundinacea growth, chemical composition, digestibility and tall fescue toxicosis
… S was lower in NI, compared to EI tall fescue. Insect resistance was higher in EI, compared to NI. Yield and chemical composition of high and low EI tall fescue were measured at four growth stages (stockpiled, prebloom, bloom and regrowth after harvest at bloom), two sites (Glade Spring and …
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Feral oilseed rape populations within a scottish landscape : Implications for GM coexistence and environmental risk assessment
… density of oilseed rape crops. <br/><br/>The insect communities associated with feral oilseed rape and a related ruderal plant charlock were compared to gauge the potential ecological impact of ferality. Ferals did not appear to compete with charlock but provided an additional host for those …
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A Role for Inositol Pyrophosphates in Arabidopsis Defense Against Herbivorous Insects
… also having elevated PP-InsPs, was fed upon by insect larvae comparably to Wild-Type Arabidopsis (WT). The data implicate VIP2, InsP8, and possibly the PP-InsP biosynthesis as a whole.
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Eliciting farmer preferences for rice varietal trait improvements using an experimental methodology based on investment games
… such as lodging tolerance, and disease and insect resistance. This is perhaps not surprising, because, on average, the replacement variety selected for improvement is already accepted in the market, i.e. it has the grain quality traits that Filipino consumers prefer (long and slender). On …
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Field-evolved resistance to Cry3Bb1 corn by the western corn rootworm: Investigations of resistance, emergence, node-injury ratings, and fitness
… western corn rootworm has repeatedly developed resistance to management techniques such as crop rotation (by ovipositing in non-corn crops) and some conventional insecticides, which supports the expectation that evolution of resistance by the western corn rootworm is the main threat to the …
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The organization and evolution of heterochromatin in the Anopheles gambiae complex
… control methods still have risks that include insect resistance, environmental toxicity, human health, as well as animal health. In order to develop new strategies that either produce novel targeted insecticides or transgenic mosquitoes that can replace current mosquito populations, it is …
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The movement behavior and reproductive ecology of western corn rootworm beetles (coleoptera: chrysomeliae) in Bt cornfields with structured and seed blend refuges
… thuringiensis Berliner) corn hybrids expressing insecticidal Cry proteins since 2003. To slow the evolution of resistance to Cry proteins, the Environmental Protection Agency mandated an insect resistance management (IRM) plan requiring the planting of non-Bt refuges as structured blocks or …
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Efektifitas estrak etanol rimpang alang-alang (mperta cylinca) sebagai larvasida nyamuk (Aedes aegypti L) instar III
… vector mosquito which belongs to a class of insects. Eradication of Aedes aegypti with the termination of life cycle has a lot to do, but until now the main disease vector control Hemorrhagic Fever (DHF) are still concentrated on combating the chemical can cause insect resistance and …
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Exploring the uptake of genetically modified white maize by smallholder farmers: the case of Hlabisa, South Africa
… maize that possessed the herbicide tolerant and insect resistant traits; seven farmers who used white insect resistant maize and 11 non-GM maize farmers. In addition, five key informant interviews and three focus group discussions were used to collect data. The history of agriculture in the area …
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Western corn rootworm (Coleoptera: Chrysomelidae; Diabrotica virgifera virgifera LeConte) emergence and abundance in transgenic cornfields with structured and seed blend refuges
… for a decade. To delay western corn rootworm resistance to Bt toxins, growers must plant a non-Bt “refuge” in each Bt cornfield. This allows susceptible larvae to develop without exposure to the Bt toxin(s). Matings between susceptible adults and potentially resistant adults developing on Bt …