The possible development of resistance in Heliothis spp. to pyrethroid insecticides has created concern a out how to best use these chemicals. This concern has prompted an in-depth examination of the effects of pyrethroids on insect physiology and behavior. Linn & Roelofs (1984) tested the effect of sublethal amounts of permethrin on males of the oriental fruit moth, Grapholitha molesta (Busck), and found that the males would respond but could not maintain flight to the source of the pheromone. More recently Haynes & Baker (1985), using a wind tunnel, found that response of pink bollworm males to pheromone sources was affected for up to 4 days by sublethal concentrations of permethrin and calling by the female was affected for more than 4 days.