Development of Resistance to Synergized Pyrethrins in Body Lice, and Cross Resistance to DDT1

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Abstract:

A strain of body lice maintained in the laboratory for 14 years without exposure to any insecticides was subjected to progressively increased concentrations of pyrethrins plus sulfoxide for 56 generations. Resistance to the synergized pyrethrins gradually developed to about seven or eight times that of the parent colony. Cross resistance to DDT developed slowly lit first, but in later generations increased rapidly until the lice could no longer be killed by exposure to doth treated with 10% of DDT in an acetone solution. There was little or no resistance to lindane, two- to four-fold resistance to synergized allethrin, and none to malathion.

Document Type: Research Article

Publication date: August 1, 1961

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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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