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The Supposed Correlation between the Ratio X5 and DDT-Resistance in House Flies

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The ratio of X5, defined by Bigelow and LeRoux as the width of the second abdominal sternite divided by its length, was measured on both sexes of eight strains of house flies, Musca domestica L., differing in their susceptibility to DDT. Resistance levels were determined by topical application of the insecticide followed by a maximum likelihood probit analysis of the results. Significant differences among strains and among rearing jars within strains were found, as in an earlier study by Sokal and Hunter. Significant differences between resistant and nonresistant strains were found for X5, but the difference was opposed to that reported by Bigelow and LeRoux and by Morrison. Further analyses led to the conclusion that the difference between resistant and nonresistant strains is due to the particular strains composing the present study and that no correlation between resistance and X5 can be demonstrated.

Document Type: Research Article

Publication date: December 1, 1959

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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.
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