Toxicity of Several Residual-Type Insecticides to Selected Western Bark Beetles

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Abstract
The relative potency of several residual-type insecticides to the adult of selected western species of bark beetles was determined by topical application. The decreasing order of relative potency (95% confidence) for four insects was as follows: The western pine beetle (Dendroctonus brevicomis Lee.)—endrin, isodrin, EPN, and lindane (endrin and isodrin> lindane) >dieldrin>heptachlor, dinitrocresol, and DDT. The mountain pine beetle (Dendroctonus monticolae Hopk.)—lindance, EPN, and endrin>dieldrin and heptachlor>dinitroeresol>DDT. The fir engraver (Scolytus ventralis Lee.)—isodrin, endrin, dieldrin, and lindane (isodrin and endrin> lindane) > EPN > DDT > dinitrocresol. The California fiatheaded borer (Melanophila californica Van D.)—lindane, isodrin, dieldrin, and DDT (lindane and isodrin> DDT). An analysis of toxicity to the sexes of D. brevicomis and D. monticolae showed only two insecticides significantly more toxic to one of the sexes: heptachlor was 3.31±0.66 times more toxic to the male D. monticolae; dinitrocresol was 4.02±0.46 times more toxic to the female D. brevicomis.

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