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Efficacy of New and Standard Chemistry for Heliothine Control in Cotton

Jack Reaper, III, John D. Hopkins, Donald R. Johnson, Gus M. Lorenz, III and April M. Fisher


ABSTRACT

Monitoring and comparing the performance of new and traditional insecticides is an essential part of managing Heliothine resistance and developing effective cotton pest management programs. Two experiments were conducted to compare the efficacy of new and standard insecticides for Heliothine control in cotton. In experiment 1, all treatments reduced percentage square damage while Intrepid (0.15 lb ai/ac) and Karate (0.025 lb ai/ac) had no effect on total seasonal live larvae. A high bollworm: budworm ratio may have resulted in the pyrethroids reaching equal control levels as the Tracer (0.063 lb ai/ac) treatment. Tracer, Steward, and Denim did not differ in terms of cotton lint yield. New products Intrepid and XR-225 failed to provide greater control and yield than standard pyrethroid insecticides. In experiment 2, all treatments resulted in equal levels of square damage and live larvae. Yield of the Denim (0.01 lb ai/ac) treatment was significantly greater than that of Intrepid (0.15 lb ai/ac) and the Karate (0.028 lb ai/ac) + Intrepid tank mix. The selective use of both new and traditional insecticides can decrease the development of Heliothine resistance and result in more effective cotton pest management programs.





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Document last modified May 20, 2002