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1 February 2001 Efficacy of Insecticides of Different Chemistries Against Helicoverpa zea (Lepidoptera: Noctuidae) in Transgenic Bacillus thuringiensis and Conventional Cotton
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Abstract

Six insecticides of different chemistries were evaluated against the cotton bollworm, Helicoverpa zea (Boddie), in non-B.t. (Deltapine ‘DP 5415’, Deltapine ‘DP 5415RR’) and transgenic Bacillus thuringiensis (Berliner) (B.t.) (Deltapine ‘NuCOTN 33B’, Deltapine ‘DP 458 B/RR’) cotton. In 1998, treatments consisted of three rates each of a pyrethroid (lambda-cyhalothrin), spinosyn (spinosad), carbamate (thiodicarb), pyrrole (chlorfenapyr), oxadiazine (indoxacarb), and avermectin (emamectin benzoate) in a nonirrigated field. In 1999, treatments consisted of three rates each of lambda-cyhalothrin, spinosad, thiodicarb, and indoxacarb in an irrigated and a nonirrigated (dryland) field. The highest rate of each insecticide corresponded to normal grower-use rates. Spinosad and thiodicarb controlled H. zea in non-B.t. cotton, whereas other materials were less effective. Even though H. zea is becoming increasingly resistant to pyrethroid insecticides, lambda-cyhalothrin was highly effective in dryland B. thuringiensis cotton. Spinosad and thiodicarb were equally effective. Data indicated that reduced rates of lambda-cyhalothrin, spinosad, and thiodicarb could be used for control of H. zea in dryland B.t. cotton systems. However, reduced rates of these insecticides in a heavily irrigated B.t. cotton system did not provide adequate control.

D. S. Brickle, S. G. Turnipseed, and M. J. Sullivan "Efficacy of Insecticides of Different Chemistries Against Helicoverpa zea (Lepidoptera: Noctuidae) in Transgenic Bacillus thuringiensis and Conventional Cotton," Journal of Economic Entomology 94(1), 86-92, (1 February 2001). https://doi.org/10.1603/0022-0493-94.1.86
Received: 21 April 2000; Accepted: 1 September 2000; Published: 1 February 2001
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