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Webcasts Provided by Cotton Incorporated


Focus on Cotton

Current Performance of Vip Traits in Cotton

By David Kerns, Ph.D.
Professor
Extension Specialist
Texas IPM Program Coordinator
Department of Entomology
Texas A&M University
College Station, Texas
Phone:
318-439-4844
Email: dlkerns@tamu.edu


Watch Presentation (32 min 28 sec)

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Summary: Kerns addresses resistance to Bt traits with an emphasis on Vip traits in cotton. He begins by reviewing past and current Bt cotton technologies and presenting the results of surveys that assess resistance and technology efficacy. He goes on to suggest that much of the resistance is being driven by Bt corn, and he discusses types and levels of damage caused by Helicoverpa zea. Kerns also reviews data on the prevalence of H. zea resistance genes in the environment; for Vip cotton, the level of resistant alleles was only 1.2%. Based on percentage survivorship, the Vip resistance appears to be controlled by a single recessive gene. In terms of field performance, Kerns states that failures in Vip cotton technology are the exception, not the rule.





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