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Failures to control Helicoverpa zea (Boddie) on cotton in South Carolina were associated with resistance to pyrethroid insecticides. Resistance to cyhalothrin, cypermethrin, and permethrin was observed in a colony collected as larvae from cotton in Estill, SC, in September 1996. Cyhalothrin resistance was expressed as an incompletely dominant trait. In 1997, resistance to cyhalothrin was observed...
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