Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Life Sciences
Remote Sensing To Detect The Movement Of Wheat Curl Mites Through The Spatial Spread Of Virus Symptoms, And Identification Of Thrips As Predators Of Wheat Curl Mites, Abby R. Stilwell
Department of Entomology: Dissertations, Theses, and Student Research
The wheat curl mite (WCM), Aceria tosichella Keifer, transmits three viruses to winter wheat: wheat streak mosaic virus, High Plains virus, and Triticum mosaic virus. This virus complex causes yellowing of the foliage and stunting of plants. WCMs disperse by wind, and an increased understanding of mite movement and subsequent virus spread is necessary in determining the risk of serious virus infections in winter wheat. These risk parameters will help growers make better decisions regarding WCM management. The objectives of this study were to evaluate the capabilities of remote sensing to identify virus infected plants and to establish the potential …
Hybridization In Diabrotica Barberi Smith And Lawrence And Diabrotica Longicornis (Say) (Coleoptera: Chrysomelidae): Biology, Behavior, Field Introgression, And A Reevaluation Of Taxonomic Status, Laura A. Campbell
Department of Entomology: Dissertations, Theses, and Student Research
Diabrotica barberi Smith and Lawrence and D. longicornis (Say) are currently recognized as closely related chrysomelid species. Morphological and genetic data support that the two species are sister taxa, and hybridization has been proposed to occur. The objectives of this work were to: 1) assess life history parameters of both taxa and hybrids, 2) compare mating behavior, pheromone response, and spermatophore transfer of both taxa and hybrids, and 3) examine genetic and morphological data for evidence of introgression. Using lab-reared individuals, fitness parameters and potential for population growth were assessed. D. barberi and D. longicornis differed in longevity and fecundity. …
The Chemistry Of Lipid Signal Molecules In Insects, Sean M. Putnam
The Chemistry Of Lipid Signal Molecules In Insects, Sean M. Putnam
Department of Entomology: Dissertations, Theses, and Student Research
I report on the chemical identification of lipid signaling molecules in three species of insects and describe the chemical isolation of a bacterial product that inhibits eicosanoid biosynthesis. Chapter 2 reports that eicosanoids mediate nodulation reactions to bacterial infection in newly-emerged, but not forager honeybees. Cyclooxygenase and lipoxygenase inhibitors attenuate nodulation, which is reversed in the presence of arachidonic acid. Older adult honeybees do not produce bacterial-induced nodules, and they have fewer circulating hemocytes, from which I infer that foraging honeybees express a physiological trade-off between maintaining a biologically expensive hemocytic immune system and flight activity associated with foraging. Chapters …