Abstract
Abstract Field tests were conducted to determine he relative efficiency of Baythroid compared to Orthene, which has a wasp control label, for single-comb wasp reduction. Adults of Polistes sp. resting on rests attached to buildings were tallied. Nests were sprayed with a 0.25% Baythroid self-pressurized spray or a 1.0% Orthene PCO concentrate (20 replications each). The Orthene was applied at 20 psi using a coarse fan spray from a 3.8-liter compressed-air sprayer. Both sprays were applied randomly to nests for 2-3 s from a distance 2.5 to 3 ft between 6:15 and 10:30 A.M. on Aug 23. Five nests were used as untreated checks. Evaluation of insecticide efficacy and residual life was accomplished by comparing the percent wasp reduction on nests over time. Posttreatment counts were taken at intervals of 8 h and 1, 3, 7, 14, 21, and 28 days.
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