Abstract
Of 293 saturated organic esters tested in Oregon and California during the summers of 1968 and 1969 as attractants for yellow jacket wasps, Vespula spp., 24 were more active than the standard attractant, 2,4-hexadienyl butyrate. The most effective, the octyl and nonyl esters of pivalic and butyric acids, caught 2-2.5 times more wasps than the standard. In addition to the foregoing, 23 unsaturated esters were tested, and 3 strongly attractive chemicals were found; one of these. 3,7-dimethyl-2,6-octadienyl propionate, was twice as attractive as the standard.
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