Abstract
The susceptibilities of Heliothis virescens populations to permethrin were evaluated from 1979 to 1983. While the results of these evaluations indicated that populations in the southeastern United States were somewhat more susceptible than those in the southwest, the data showed that permethrin susceptibility levels have remained relatively stable for each location. The stability of the dose-mortality regressions indicates that H. virescens has not become resistant to permethrin nor does the development of resistance appear imminent.

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