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 20 of 30 for “"agricultural pests"”.
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Floral derived compounds as attractants for agricultural pests in the family Noctuidae
… within the family Noctuidae are significant agricultural pests. Specific floral volatiles are attractive to both male and female Noctuidae and may be used to as attractants in crop protection. For the first time the following research compares two types of floral volatile blends - those that …
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Aggregation Pheromone Biosynthesis and Engineering in Plants for Stinkbug Pest Management
Stinkbugs (Pentatomidae) and other agricultural pests such as bark beetles and flea beetles are known to synthesize terpenoids as aggregation pheromones. Knowledge of the genes and enzymes involved in pheromone biosynthesis may allow engineering of pheromone biosynthetic pathways in plants to …
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Genetics and Reproductive Isolation of Rhagoletis Flies (Fruit Fly, Eclosion, Speciation, Electrophoresis, Host Selection)
… concerned with the flies' status as agricultural pests and by evolutionary biologists interested in modes of speciation, this is the first study to provide substantial support for genetic differentiation for traits important in host selection and in maintenance of reproductive …
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Distinguishing between Chronic and Transient Poverty in Mozambique
… of common shocks (drought, floods and cyclones, agricultural pests, illness, death, and theft) on 1) food expenditures at the household level and 2) poverty rates at the national level. The results of the study indicate that shocks are one of the key determinants of household food expenditures. …
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The political ecology of nontraditional agricultural exports and an IPM project in Jamaica
… the singular reliance on pesticides to control agricultural pests. IPM involves the combination of chemical and non-chemical pest management practices to minimize pest damage to crops and reduce overall pesticide use. Although IPM has been promoted in both industrialized and Third World …
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Primary characterization of genes involved in the colony development of the insect pathogenic fungus Metarhizium anisopliae /
… is necessary to increase its virulence towards agricultural pests and thus improve its commercial efficacy. Nevertheless, the release of genetically modified conidia in crop fields may negatively affect the ecosystem. Controlling conidiation is a potential means of limiting the release of …
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Rate of Food Consumption of Acris Crepitans Blanchardi Harper in South-Central Iowa
… approximately 4,840 food items each year. Agricultural pests consumed included members from Aphididae, Cicadellidae, Curculionidae, Syrphidae, and Locustidae. Recommendations. The techniques developed for determining the rate of food passage can be applied to studies of other anurans. Field …
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Identification and Functional Characterization of Sesquiterpene Pheromone Biosynthetic Genes in Stink Bugs (Pentatomidae)
… stink bug (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 …
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ATTRACTING BENEFICIAL INSECTS TO YOUR FARM: A COMPARISON OF HABITAT MODIFICATION STRATEGIES
<p>Thoughtful planning to enhance diversity in agricultural landscapes can present a multitude of ecological, cultural and economic benefits. Land managers have many options when considering which habitat modification techniques they can implement on their agri-environment schemes. This comparative …
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Role of bats as natural pest control agents of moth pests (false codling moth and carob moth) on citrus orchard
… in the diversity of flora and fauna within agricultural landscapes through intensification of land use. An increase in agricultural intensification has resulted in increased farm sizes and reduced landscape heterogeneity. In the past two decades, the interest in services that insectivorous …
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Efficacy and biases In inspections for biosecurity threats In South Africa
Trade in agricultural commodities is beneficial economically, but it carries risks, as alien agricultural pests can be imported into new regions. To manage this challenge, inspections of agricultural produce are performed at South Africa’s ports of entry. This study aims to evaluate the efficacy …
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Weed management practice selection among Midwest U.S. organic growers
Weeds are the most costly of all agricultural pests, reducing crop yields, quality and harvestability while simultaneously increasing management expenses. Restriction of synthetic herbicide use in organic agricultural systems increases the complexity of weed management, leading organic farmers to …
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Adoption Determinants and Economic Benefits of Integrated Pest Management for Nepali Vegetable Farmers
… relies on agriculture, so invasive and native pests' ability to reduce farmers' crop yields is a significant concern. To protect farm households' food security and livelihoods, it is imperative to find effective pest management products and practices. Integrated pest management (IPM) is an …
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Valuing the ecosystem services provided by UK bats under climate change
… bats are recognised as important regulators of agricultural pests populations, yet the ecological mechanisms linking bat biodiversity to potential pest suppression, and the economic value of this service, remain poorly understood. This thesis investigates how climate change may affect bat …
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Culture-independent identification of gut bacteria in fourth-instar red imported fire ant, Solenopsis invicta Buren, larvae
… invicta Buren, are medical, urban, and agricultural pests from South America. Fourth-instar larvae are used by the colony to digest solid food and then regurgitate it for consumption by workers and queens. Larvae are an ideal source of investigations of obligate endosymbiotic bacteria …
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Morphology, phylogeny, and evolutionary development in the weevils (Insecta: Coleoptera: Curculionoidea)
… extremely important economically, being of great agricultural significance because they associate with all major groups of plants, often with negative consequences for crops. For these reasons, weevils are also of great systematic interest: few weevil systematists remain active, and (to date) few …
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Discovery and Phylogeny of the Odorant Binding and Chemosensory Proteins of Diabrotica Virgifera Virgifera (Coleoptera: Chrysomelidae) and Rhagoletis (Diptera: Tephritidae)
… putative olfactory proteins from the agricultural pests, Diabrotica virgifera and Rhagoletis suavis. OBPs and CSPs were recovered using an expressed sequence tag approach. Their protein structures were characterized, and their intraspecific relationships and phylogenetic positions …
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Abundance and Species Diversity of Thrips (Thysanoptera: Thripidae) in Cotton, Soybean, and Peanut in Southeast Virginia, and Evaluation of Cyantraniliprole for Thrips Management
Thrips are major agricultural pests throughout much of the United States. More information is needed about sampling methods, management practices, and insecticide susceptibility to help better control this pest. A two year survey was conducted to determine the species present in southeast Virginia …
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A Bio-Economic Model of Long-Run Striga Control with an Application to Subsistence Farming in Mali
… world's most tenacious, prolific and destructive agricultural pests. Crop loss estimates due to Striga infestations can reach 100 percent. Furthermore, the weeds' affinity for low-fertility soils and low rainfall means that those farming the most marginal lands are most severely affected. …
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Integrative approach to discovering species diversity within the Mediterranean group of the Bemisia tabaci complex
… which includes some of the world’s most damaging agricultural pests. The Mediterranean (MED) putative species is globally invasive and its populations are often resistant to insecticides. The intra-species genetic variability identified in partial sequences of the mitochondrial cytochrome c …
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