ABSTRACT
The evolution of resistance to the synthetic pyrethroids is a phenomenon that affects all members of the agricultural community. The increasing costs of insect control technology and crop production make it imperative that we attempt to clearly understand the current status and mechanisms of pyrethroid resistance in important insect pests. To address this issue, a U.S. branch of the Pyrethroid Efficacy Group (PEG) was formed at the last Beltwide Cotton Conference in Dallas, Texas. During the summer of 1987, an extensive monitoring effort was conducted by researchers from Du Pont, FMC, Hoechst-Roussel, ICI, and mobay. The results of this program will be reviewed and compared to other pyrethroid resistance monitoring programs conducted throughout the Cotton Belt. The results of these monitoring efforts should provide us with valuable information on the geographic status of resistance in Heliothis virescens, a comparison of different monitoring tools and the relative value of these tools for evaluating the effectiveness of strategies to combat resistance.
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