Effectiveness of Bt Cotton Towards Bollworms and Benefit of Supplemental Oversprays

Tuesday, March 15, 2016: 9:00 AM
Magnolia Room I (Sheraton Raleigh Hotel)
David L. Kerns , Louisiana State University Agricultural Center, Winnsboro, LA
Sebe Brown , Macon Ridge Research Station, Louisiana State University, Winnsboro, LA
Angus Catchot , Dept. of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Mississippi State, MS
Don Cook , Delta Research and Extension Center, Mississippi State University, Stoneville, MS
Jeff Gore , Delta Research and Extension Center, Mississippi State University, Stoneville, MS
Fangneng Huang , Louisiana State University, Baton Rouge, LA
Gus Lorenz , Division of Agriculture, Cooperative Extension Service, Dept. of Entomology, University of Arkansas, Lonoke, AR
Nicholas Seiter , Division of Agriculture, Cooperative Extension Service, Dept. of Entomology, University of Arkansas, Monticello, AR
Scott Stewart , Entomology & Plant Pathology, The University of Tennessee, Jackson, TN
Glenn Studebaker , University of Arkansas Cooperative Extension Service, Keiser, AR
Fei Yang , Entomology, Louisiana State University, Baton Rouge, LA
Since the introduction of Bt cotton in the United States in 1996, management of the bollworm has become much less problematic. However, there are still incidents where unacceptable fruit injury is experienced and insecticidal oversprays are utilized to prevent yield loss. There has been much speculation surrounding the reasons for control failures among Bt cotton technologies including Bt resistance or tolerance, inadequate expression of Bt toxins expression due to plant phenology or environmental stressors. The objective of this project was to evaluate the efficacy of second and third generation Bt cotton at multiple locations within the Mid-South for efficacy towards bollworms and to determine if overspraying Bt cotton results in a reduction in damage and increased yields relative to non-Bt cotton. Additionally, we report diet incorporated and leaf tissue bioassays with Cry1Ac.

See more of: Contributed Papers I: Plant-Insect Ecosystems
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