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 “"crop pest"”.
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Economic Aspects of Crop Pest Management and Monarch Conservation
… rise in prophylactic chemical treatments for pest and weed control in the past two decades have raised many environmental concerns. Although cost effective, such treatments which include neonicotinoids and herbicide tolerant (HT) crops contaminate soil and water and cause wildlife habitat …
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Overwintering biology of the brown marmorated stink bug, Halyomorpha halys (Hemiptera: Pentatomidae)
The invasive crop pest Halyomorpha halys has been established in Ontario since 2012 and poses a significant threat to Canadian agriculture. I investigated the tolerance of H. halys to three stressors - low temperatures, desiccation, and energy depletion - in addition to investigating the role of …
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Evaluation and annotation of Bemisia tabaci transcriptome data using paired-end RNA sequencing
Bemisia tabaci (B. tabaci), a major crop pest of important food security crops, transmits more than 100 plant viruses. Despite its global importance as one of the world’s top 100 invasive species, limited genomic resources are available in public domains. In this study, transcriptomic datasets from …
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Molecular evolution of a superfamily of chemoreceptors in Musca domestica and Ceratitis capitata
… fruit fly (Ceratitis capitata) are two important pest species. While both are generalists, the first is a major vector of a variety of human and livestock disease, while the second is a broadly polyphagous herbivore and important crop pest. Each must be able to navigate a complex set of chemical …
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Characterizing global gene expression and antiviral response in Frankliniella occidentalis infected with Tomato spotted wilt virus
… strategies for studying thrips gene function and crop-pest control. To this end, my specific research objectives were to: 1) generate, assemble, and annotate a RNA-Seq-derived transcriptome for F. occidentalis using the thrips genome, and to quantify global gene expression in response to TSWV …
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Is Everything Connected? Following the Predators, Pests, and Plants Within a No-Till, Western Montana Agroecosystem
… predatory insects that may decrease the need for pesticide use. The purpose of this research was twofold. First, this on-farm research assessed the population and activity of six beneficial arthropod predators - the carabid beetle (Carabidae: Coleoptera), minute pirate bug (Orius spp.: Hemiptera), …
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Is Everything Connected? Following the Predators, Pests, and Plants Within a No-Till, Western Montana Agroecosystem
… predatory insects that may decrease the need for pesticide use. The purpose of this research was twofold. First, this on-farm research assessed the population and activity of six beneficial arthropod predators - the carabid beetle (Carabidae: Coleoptera), minute pirate bug (Orius spp.: Hemiptera), …
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Mechanisms of Flavin-Dependent Monooxygenases Involved in Natural Product Chemistry
… an oxidized product. ZvFMO, from the insect food crop pest, Zonocerus variegatus, was determined to catalyze a highly uncoupled oxygenation reaction of the nitrogen or sulfur atom of various substrates. OxaD, from Penicillium oxalicum F30, catalyzes novel sequential oxidation reactions of the …
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The effect of reduced cultivation on selected soil fauna
… and zero tilled. These were sampled during three crop years for surface dwelling earthworms and epigeic fauna. The effects of straw baling and burning, on the numbers and species of surface dwelling earthworms, and of epigeic invertebrateswas investigated at the second farm, Ashley Hall in …
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Role of labellar and ovipositor taste sensilla of Drosophila suzukii in host recognition: a morpho-functional and behavioural approach.
Drosophila suzukii is an invasive and destructive crop pest that originated in Southeast Asia. Unlike most other Drosophila species which attack only decaying or rotten fruits, this species has the ability to infest healthy fruits because of its serrated ovipositor used to pierce the skin of fruits …
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Identification and Functional Characterization of Sesquiterpene Pheromone Biosynthetic Genes in Stink Bugs (Pentatomidae)
… (Nezara viridula) are significant agricultural pests both in the United States and globally. The aggregation or sex pheromones produced by these insects are known to be bisabolene-type sesquiterpenoids; however, the biosynthetic pathways in the formation of these pheromones are unknown. Here we …
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The biological control of the weed Acacia longifolia by the gall wasp Trichilogaster acaciaelongfoliae: a study of a plant-insect interaction
Weeds are responsible for about 30 percent of all crop losses worldwide, but all weed research, including biological control, receives only about 10% of crop pest control support. The impact of weeds is insidious, diffuse, and complex Increased use of biological control may help to reduce the …
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Physiological and Morphological Responses to Drought Stress in Different Cultivation Environments in Wild Type and ABA-deficient Barley
… plant morphology and physiology and therefore crop productivity. Although the effects of drought on plants are widely studied, studies are often conducted in controlled greenhouse or laboratory conditions rather than more realistic field-like conditions. This is justified by the lower costs, …
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Establishment of COTESA VESTALIS (HALIDAY) and DIADROMUS COLLARIS (GRAV.) parasitoids of the DIAMONDBACK MOTH, PLUTELLA XYLOSTELLA (L.), and assessment of the effectiveness of C. VESTALIS as a biological control agent in Zambia
… (L.) (Lepidoptera: Plutellidae), a serious pest of vegetables in Zambia, and to assess the effectiveness of one of the released parasitoids, C. vestalis, as a biological control agent of the pest. Confirmation of the establishment of the exotic parasitoids was through field sampling and …