Yellow Jacket Control by Baiting. 1. Influence of Toxicants and Attractants on Bait Acceptance

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Abstract
Twelve insecticides incorporated into fish-flavored cat food were compared as baits for Vespula pensylvanica (Saussure). They included chlorinated hydrocarbon, organophosphate. and carbamate insecticides and with the exception of mirex, imparted varying degrees of repellency to the baits. Artificial attractants were synthesized and field tested. The addition of I of these, heptyl crotonate, doubled the amount of 0.5% mirex bait and tripled the amount of 1% mixed bait removed by yellow jackets. Excellent control of yellow jackets was obtained in test areas ranging in size from a single residential lot to about 40 hectares (100 acres). Annual control was obtained with a single baiting at any time during the production of brood. One bait station, containing 450 g of bait, per 2 hectares gave control. Rebaiting was done only when most of the bait was removed by the yellow jackets within the 1st week of control. bait was acceptable to yellow jackets as long as it remained.

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