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A strain of Pediculus humanus humanus L. from Burundi was colonized in the laboratory and adapted to feeding on rabbits. At the LC50 level, resistance to malathion was 37X in the F2 generation but decreased to 4X in the F14 generation. After being placed under malathion pressure in the F15 generation, resistance increased to 8X in the F23generation. In a sub strain, separated from the original in the F15 generation and maintained without insecticidal pressure, malathion resistance decreased to 1X in the F23 generation at the LC50 level, hut some resistance still existed at the LC00 level. Both strains showed a high resistance to DDT and lindane and variable patterns of cross-resistance to other insecticides.
Document Type: Research Article
Publication date: February 1, 1973
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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.