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 8 of 8 for “"Helicoverpa zea"”.
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Molecular Definition of Cytochrome P450 -Mediated Multiple Resistance in Helicoverpa Zea
… I conducted a series of experiments with Helicoverpa zea, a polyphagous noctuid of economic importance. Studies at the population level demonstrated that exposure to xanthotoxin, a linear furanocoumarin, enhanced resistance to the insecticide cypermethrin. Piperonyl butoxide (PBO) …
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Insect pest management in hemp in Virginia
… pests were present, including corn earworm (Helicoverpa zea [Boddie]) (Lepidoptera: Noctuidae), brown marmorated stink bug (Halyomorpha halys [Stål]) (Hemiptera: Pentatomidae), and cannabis aphid (Phorodon cannabis) (Hemiptera: Aphididae). In 2019, indoor production surveys revealed that …
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Development of microbial control for lepidopteran pests of the corn ear
… nuclear polyhedrosis virus (AfMNPV) to control Helicoverpa zea (Boddie) was evaluated in the laboratory and in the field on corn. The virulence of the entomopathogens for Ostrinia nubilalis (Hubner) and Spodoptera frugiperda (J. E. Smith) was also evaluated in the laboratory;Three Bt products …
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Damage-Induced Spatial Heterogeneity of Photosynthesis: Mechanisms and Analysis
… Herbivory by Popillia japonica and Helicoverpa zea (Boddie) caused a 20--90% increase in transpiration from soybean leaflets without affecting carbon assimilation rates or photosynthetic efficiency (phiPSII). The depression of phiPSII caused by fungal infections and galls on hardwood …
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Improving Integrated Pest Management in Sweet Corn System
Corn earworm (CEW), Helicoverpa zea (Boddie), (Lepidoptera: Noctuidae) is a common insect pest of sweet corn in the United States. The larvae cause chewing damage on corn ears rendering them unmarketable. Traditionally, growers have controlled CEW in sweet corn using multiple applications of …
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Developing an integrated pest management program for edamame in Virginia
… treatments. Lastly in 2020-2021, corn earworm (Helicoverpa zea [Boddie], Lepidoptera: Noctuidae), an important soybean pest and most likely a major pest of edamame, was tested for pyrethroid susceptibility and resistance across the state using a bean-dip bioassay. Pyrethroid efficacy to control …
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Adaptation and hybridization in Helicoverpa crop pests
… I focus on noctuid crop pests in the genus Helicoverpa, which are among the most economically significant agricultural pests in the world. Helicoverpa armigera was first reported as an invasive species in Brazil in 2013, where it hybridized with its native sister species Helicoverpa zea. The …
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Toxicity of mycotoxins to insects and underlying molecular and biochemical mechanisms
… In this study, three insects, including Helicoverpa zea (corn earworm), Amyelois transitella (navel orangeworm) and Apis mellifera (honey bee) varying in their exposure to mycotoxins were selected to study toxicity of mycotoxins to insects and to elucidate their underlying mechanisms of …