A Gross Genetic Analysis of Two DDT-Resistant House Fly Strains

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A genetical analysis was undertaken for factors conferring DDT resistance in 2 strains of the house fly, Musca domestica L. The Grothe strain possesses a moderate (200-fold) resistance to DDT and is susceptible to the nondehydrochlorinatable analog of DDT, ortho-chloro DDT. The Orlando DDT strain is more highly resistant (>3000-fold) to both insecticides. Both strains were found to possess a fifth chromosomal dominant which confers moderate (100- to 200-fold) resistance to DDT, but does not confer resistance to o-chloro DDT. In addition, the Orlando DDT strain possesses a second chromosomal recessive which confers moderate (100- to 150-fold) resistance to DDT and high tolerance to o-chloro DDT (>3000-fold). The presence of both factors in a single strain confers virtual immunity (more than 5000-fold resistance) to DDT. From crosses between the Orlando DDT strain and susceptible marker strains, 2 substrains were isolated, each possessing only 1 major factor for resistance. Appropriate crosses and bioassays provided confirmation of the nature of the 2 independent factors for resistance. Resistance associated with the fifth chromosomal dominant is that for DDT dehydrochlorinase. The second chromosomal recessive is probably hdr-o as described by Milani (1960, Misc. Pub. Entomol. Soc. Amer. 2: 75-83). The mechanism of resistance associated with this factor is unknown, but apparently it does not involve dehydrochlorination.

Document Type: Research Article

Publication date: June 1, 1966

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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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