In a study with a new authentic sample of cis-allethrin, its toxicity relative to trans allethrin and allethrin itself and the intensity of synergism of their 1: 10 mixtures with piperonyl butoxide were evaluated when applied as kerosene sprays on the Campbell turntable. The house fly (Musca domestica L.) was used as the test insect. cis-Allethrin was 0.546as toxic as allethrin. The new estimation of the ratio for trans-allethrin and two previous estimations furnished a mean of 1.19:t for that fraction. On the basis of these two evaluations the trans fraction comprised 70% and the cis fraction 30% of the sample of allethrin. This result agrees very well with reported results obtained by an infrared spectrophotometric method. On the basis of equivalents the piperonyl butoxide mixtures of trans-allethrin, cis-allethrin, and allethrin were, respectively, 2.94, 1.33, and 2.55 as toxic as allethrin alone. Synergism was demonstrated in all three mixtures, its intensity ratio for each being about 2.6 at the 50%, 1.8 at the 5%, and 3.7 at the 95% mortality levels. All sprays caused more than 90% knockdown of flies.
Document Type: Research Article
Publication date: February 1, 1958
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.