Theses and Dissertations
Activity level of Helicoverpa armigera Nucleopolyhedrovirus (HearNPV) and feeding habits of Helicoverpa zea larvae after ingestion of HearNPV in Mississippi soybean
Mississippi State University
Catchot, Angus L., Jr.
Crow, Whitney D.
Cook, Donald R.
Date of Degree
Graduate Thesis - Open Access
Master of Science (M.S.)
College of Agriculture and Life Sciences
Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology
HearNPV was applied to a soybean field and evaluated for residual efficacy at different time intervals (0, 12, 24, 36, 48, and 72 hours) after application in laboratory bioassays with treated leaves. Larval mortality was rated at five, seven and twelve days after larval infestation. Larval mortality increased as the number of days after infestation increased. To evaluate the feeding habits of Helicoverpa zea at the 2nd and 3rd instar, HearNPV exposed larvae and untreated larvae were weighed at zero (before diet exposure), four, and seven days. At four days after exposure, larval weight gain of specimens exposed to HearNPV was reduced by 80% and 45% for 2nd and 3rd instar larvae, respectively. At seven days after exposure, larval weight gain of 3rd instar specimens exposed to HearNPV was reduced by 60%.
Fortenberry, Judge Tyler, "Activity level of Helicoverpa armigera Nucleopolyhedrovirus (HearNPV) and feeding habits of Helicoverpa zea larvae after ingestion of HearNPV in Mississippi soybean" (2023). Theses and Dissertations. 5750.