Insecticidal Effectiveness of Sprays and Aerosols Containing Allethrin

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Abstract
The completely synthetic allyl homolog of cinerin I compared favorably with the natural pyrethrins when tried in kerosene-base sprays against house flies (Musca domestica). In aerosols the synthetic ester gave results similar to the pyrethrins against this insect. At low concns. against mosquitoes the synthetic ester was less toxic than the pyrethrins. Increased dosages gave satisfactory performance. In aerosol tests against American cockroaches (Periplaneta americana), the synthetic ester was much inferior to the natural pyrethrins, although the latter were not very effective at the concns. tested. Distillation of the synthetic ester did not change the effectiveness of this ester against house flies. Storage of aerosols containing this ester did not change effectiveness. DDT-resistant house flies showed some resistance to the synthetic ester. In tests with high-pressure aerosols against house flies piperonyl butoxide, n-propyl isome, and sesame oil extractives all showed synergism with the synthetic ester. There was considerable re-recovery of flies knocked down with the sesame oil extractives formulation. The mixtures containing n-propyl isome acted similarly with the synthetic and with natural pyrethrins. The Van Dyk 264 formulations appeared to give slightly better kill, when the synthetic ester was used. The knockdown was lower, but the mortality was the same, when piperomyl butoxide was used with the synthetic ester. The synthetic ester was equal to the natural pyrethrins in one of the U. S. Public Health Service aerosols and also in the Tentative Official Test Aerosol formulation when tested against house flies.

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