Serial dilutions of technical material of eleven different insecticides dissolved in acetone were applied topically to tarnished plant bugs, Lygus lineolaris (Palisot de Beauvoir), collected from three mid-Delta counties in Mississippi, which represented an area commonly experiencing high levels of insecticide use, and from a county in north Arkansas, representing an area with low levels of insecticide use. Tolerance of tarnished plant bugs to six of the eleven materials was significantly greater in most cases in those collected from the mid-Delta counties of Mississippi than those collected in north Arkansas.

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