EFFICACY OF NEW AND STANDARD CHEMISTRY FOR HELIOTHINE CONTROL IN COTTON

摘要

Monitoring and comparing the performance of new and traditional insecticides is an essential part of managing Heliothineresistance and developing effective cotton pest management programs. Two experiments were conducted to compare theefficacy of new and standard insecticides for Heliothine control in cotton. In experiment 1, all treatments reduced percentagesquare damage while Intrepid (0.15 lb ai/ac) and Karate (0.025 lb ai/ac) had no effect on total seasonal live larvae. A highbollworm: 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 failedto provide greater control and yield than standard pyrethroid insecticides. In experiment 2, all treatments resulted in equallevels of square damage and live larvae. Yield of the Denim (0.01 lb ai/ac) treatment was significantly greater than that ofIntrepid (0.15 lb ai/ac) and the Karate (0.028 lb ai/ac) + Intrepid tank mix. The selective use of both new and traditionalinsecticides can decrease the development of Heliothine resistance and result in more effective cotton pest managementprograms.