Abatement of Yellowjackets Using Encapsulated Formulations of Diazinon and Rabon13

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Abstract
Abatement of Vespula pensylvanica (Saussure) and V. rulgaris (L.), using encapsulated formulations of diazinon (0.5%) and Rabon® (2 chloro-1-(2,4,5-triehlorophenyl) vinyl dimethyl phosphate) (0.75%), in 9-Lives® tuna (for cats), was demonstrated at 8 test sites in northern California in 1971 and 1972. Foraging yellow jackets were reduced an estimated 75-95% after only 2 days of exposure to bait. Subsequent treatments were needed 10 days later to control yellowjackets that received no toxicant initially. Varying amounts of diazinon in dead yellow jackets, according to stage of development, were recovered from 2 ground nests by chemical analyses. Rabon and diazinon are highly repellent to yellow jackets, even at low concentrations. Encapsulation masks the chemical odor emitted by the insecticides, but it does not, alter their effectiveness as control agents.

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