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Specific resistance to the organophosphorus insecticide malathion in the RM strain of the Australian sheep blow fly, Lucilta cuprina (Wiedemann), is controlled by an incompletely dominant gene on chromosome 4. This gene, RMAL, was shown to be 24.5 ± 1.3 map units from the visible marker gene sv. The major gene for resistance to diazinon and other organophosphorus insecticides, ROP-1, was mapped at 21.8 ± 1.3 units from sv. It was not possible to separate the locations of RMAL and Rop-1 in the mapping experiments. However, an allelism test showed that the two genes were closely linked but independent of each other on chromosome 4. Malathion-specific resistance was also shown to be associated with high esterase activity. No significant recombination could be detected between RMAL and a single locus controlling high esterase activity, suggesting that malathion resistance is derived from enhanced esteratic metabolism of the insecticide.
Document Type: Research Article
Publication date: June 1, 1986
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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.