Control of Ground-Nesting Yellow Jackets with Toxic Baits—a Five-Year Testing Program1

Abstract
A cooked horsemeat bait containing 1% chlordane wp, which was exposed in protected dispensers for retrieval by foraging yellow jackets for larval and colony destruction, controlled 2 species of ground-nesting yellow jackets, Vespula pensylvanica (Saussure) and V. vulgaris (L.), in park and suburban areas in San Mateo County, California. Highly effective control was obtained by using 1 dispenser (4 oz toxic bait) per 2 acres at a cost of $2.00 per acre in smaller park areas.

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