Effectiveness of Bt Cotton Towards Bollworms and Benefit of Supplemental Oversprays

Tuesday, March 17, 2015: 3:15 PM
Magnolia G (Beau Rivage Resort & Casino)
David L. Kerns , Macon Ridge Research Station, Louisiana State University, Winnsboro, LA
Gus Lorenz , Division of Agriculture, Cooperative Extension Service, Dept. of Entomology, University of Arkansas, Lonoke, AR
Jeff Gore , Delta Research and Extension Center, Mississippi State University, Stoneville, MS
Angus Catchot , Dept. of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Mississippi State, MS
Glenn Studebaker , Division of Agriculture, Cooperative Extension Service, Dept. of Entomology, University of Arkansas, Keiser, AR
Scott Stewart , Department of Entomology and Plant Pathology, University of Tennessee, Jackson, TN
Don Cook , Delta Research and Extension Center, Mississippi State University, Stoneville, MS
Sebe Brown , Macon Ridge Research Station, Louisiana State University, Winnsboro, LA
Current commercially available pyramided gene cotton was evaluated for efficacy to bollworm, Helicoverpa zea.  Along with a non-Bt variety, these technologies included: Bollgard II, Widestrike, Twinlink and Widestrike 3.  Each variety/technology consisted of split plots, treated with insecticides for bollworms and non-treated.  In 2014, tests were conducted at five locations across Louisiana, Mississippi, Arkansas and Tennessee.  Non-Bt cotton greatly benefited from insecticide applications targeting bollworms.  Among the Bt technologies, Widestrike benefited from oversprays while the technologies saw increases in yield from overspray at only one location.  These data suggest that all currently available technologies may benefit from oversprays targeting bollworms under certain conditions.  Additionally, our data demonstrates that even newly released 3 gene technologies are not immune to unacceptable bollworm injury and that bollworm survivorship on Bt cotton is not uncommon.  If Bt resistance does occur in Bt cotton, it is extremely unstable and highly transitory.

See more of: Contributed Papers II: P-IE – IPM; P-IE – Resistance Management; P-IE – Transgenic Plants
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