ABSTRACT

Sixteen pairs of pheromone-baited wire cone traps representing 11 parishes in Louisiana were used to survey insecticide susceptibility of tobacco budworm and bollworm from Jun to Sep during 2002. Percent survival (10mg/vial cypermethrin in AVT) of tobacco budworm moths ranged from 47% to 69%, with a mean survival of 61%. Percent survival (5mg/vial cypermethrin in AVT) for bollworm moths ranged from 26% to 42%, with a mean survival of 34%. No bollworm control failures with pyrethroids were reported in Louisiana during 2002. Susceptibility of tobacco budworm and bollworm to spinosad also was monitored using the AVT (5mg/vial and 15mg/vial concentrations). Tobacco budworm survival ranged from 31% to 70% and 0% to 20% for the 5mg/vial and 15mg/vial concentrations, respectively. Higher than expected survival (31% to 56% at 15mg/vial) of male tobacco budworm moths was observed at several locations in Northeast Louisiana. Bollworm survival ranged from 47% to 63% and 11% to 18% for the 5mg/vial and 15mg/vial concentrations, respectively. Problems in controlling infestations of tobacco budworm following applications of Tracer 4SC (spinosad) were reported in isolated fields in Northeast Louisiana during 2002.