COMPARATIVE TOXICITY OF LINDANE, CARBARYL, AND CHLORPYRIFOS TO THE WESTERN PINE BEETLE (DENDROCTONUS BREVICOMIS) (COLEOPTERA: SCOLYTIDAE) AND TWO OF ITS PREDATORS,ENOCLERUS LECONTEI(COLEOPTERA: CLERIDAE) ANDTEMNOCHILA CHLORODIA(COLEOPTERA: TROGOSITIDAE)

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Abstract
Each of three insecticides—lindane, carbaryl, chlorpyrifos—was tested by topical application on the western pine beetle,Dendroctonus brevicomisLeConte, and two native coleopterous predators,Enoclerus lecontei(Wolc.) andTemnochila chlorodia(Mann.), to assess comparative toxicity. Lindane was more toxic to the predators than to western pine beetle, while carbaryl was relatively non-toxic toE. leconteiwhen compared with eitherT. chlorodiaor western pine beetle. Chlorpyrifos was equally toxic to all three species. Results of topical application serve to estimate relative effects of insecticides on predacious associates in the western pine beetle community.