Abstract
New pyrethrin-like compounds are compared with earlier synthetic pyrethroids and natural pyrethrins for intrinsic toxicity to adult mosquitos and for residual contact activity. Two of the compounds are at least as toxic as pyrethrin I to female Anopheles stephensi and Aedes aegypti. Residues of these compounds are very persistent in the dark or in very subdued lighting but they decompose on exposure to normal intensities of daylight and rapidly lose their insecticidal activity.
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