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Helicoverpa Zea (Boddie) (Lepidoptera: Noctuidae) Larval Distribution On Different Bt Technologies And Evaluating Cotton Plant Tissue Assays For Resistance Monitoring, Dawson David Kerns

Masters Theses

Field trials were conducted in 2018 and 2019 to determine if an insecticide treatment and different Bt (Bacillus thuringiensis) cotton technologies had an effect on bollworm, Helicoverpa zea (Lepidoptera: Noctuidae), distribution in the cotton canopy. Non-Bt, Cry1Ac + Cry1F, and Cry1Ac + Cry2Ab cotton varieties were either treated with an insecticide or left untreated after a bollworm, infestation was detected. Cotton plants were mapped for signs of bollworm feeding on floral structures (i.e., bolls, squares, flowers) and the physical presence of larvae. No major differences in the pattern of feeding injury and distribution of larvae were found among the different …