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2002 Bollgard II™ Performance in the Southeast

Stew Sherrick, Dan Pitts, Rich Voth, and Walt Mullins

ABSTRACT

Cotton containing Bollgard II® insect protection was evaluated across the southeastern states in 2002. Lepidopteran insect pressure ranged from low to extreme across the testing locations. Bollgard II was compared to Bollgard® and non-B.t. cotton in all trials. Some trials included sprayed versus unsprayed subplots. Averaged across all locations, Bollgard II protected cotton sustained less than one percent boll damage from cotton bollworm (Helocoverpa zea) through the season while Bollgard cotton sustained 2.4% boll damage in lepidopteran sprayed and 8.4% boll damage in un-sprayed plots. Non-B.t. cotton sustained an average of 44% boll damage in un-sprayed plots and 9.8% in sprayed plots. Bollgard II also provided excellent protection against beet armyworm (Spodoptera exigua) and soybean looper (Pseudoplusia includens) as compared to Bollgard and non-B.t. cotton. Insect protection provided by Bollgard and Bollgard II resulted in increased yields above non-B.t. cotton with Bollgard II showing the greatest potential for increased yields.





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Document last modified April 16, 2003