Capture^® 2EC (bifenthrin) has been extensively evaluated in field efficacy and laboratory bioassay trials during the past years for control of the major insect and mite pests of cotton. Several field-laboratory bioassays have demonstrated that the residual control achieved with Capture^® 2EC is longer than that achieved with Karate^® Z or Baythroid^® 2EC. Supporting the theory that the decreased photodegradation rate of Capture would result in greater biological control. These trials also revealed a more rapid decline in residual activity for Karate^® Z when compared to Karate^® 1EC. In the absence of rainfall, the level of Heliothis virescens (F.) control for Karate^® Z drops significantly between 4 and 6 days after treatment. Rainfall accelerated this decline with a significant drop in activity ocurring less than 3 days after treatment.