Activity level of Helicoverpa armigera Nucleopolyhedrovirus (HearNPV) and feeding habits of Helicoverpa zea larvae after ingestion of HearNPV in Mississippi soybean

Author

Judge Tyler Fortenberry, Mississippi State UniversityFollow

Issuing Body

Mississippi State University

Advisor

Catchot, Angus L., Jr.

Committee Member

Crow, Whitney D.

Committee Member

Gore, Jeffrey

Committee Member

Cook, Donald R.

Date of Degree

5-12-2023

Document Type

Graduate Thesis - Open Access

Major

Entomology

Degree Name

Master of Science (M.S.)

College

College of Agriculture and Life Sciences

Department

Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology

Abstract

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 2^nd and 3^rd 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 2^nd and 3^rd instar larvae, respectively. At seven days after exposure, larval weight gain of 3^rd instar specimens exposed to HearNPV was reduced by 60%.

Recommended Citation

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.
https://scholarsjunction.msstate.edu/td/5750