Abstract
Male moths of the Douglas-fir tussock moth ( Orgyia pseudotsugata [Mc-Dunnough]), the western spruce budworm ( Choristoneura occidentalis Freeman), and the western pine shoot borer ( Eucosma sonomana Kearfott), were equally attracted to their respective sex pheromones whether or not 50 mg of certain pesticides were also present in traps. Electroantennagram responses of adult male O. pseudotsugata and C. occidentalis to pesticides were also very low. Male C. occidentalis searched out and frequently contacted synthetic pheromone releasers attached to tree branches. Males of O. pseudotsugata , although readily attracted to within a few centimeters, seldom contacted the releasers. These results suggest that addition of pesticide to, or around, a slow-release formulation of sex pheromone might effectively kill males of some species, such as C. occidentalis , but not others.
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