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Resistance to Pyrethroids and DDT in a Field-Mixed Population of Argentinean Black Flies (Diptera: Simuliidae)

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Field-mixed populations of Simulium bonaerense (CoscarĂ³n & Wygodzinsky) and S. wolffhuegeli (Enderlein) from an agricultural region of northern Patagonia (Argentina) were tested for insecticide resistance. High levels of resistance at the LC50 were found toward DDT (59.2-fold) and the pyrethroids deltamethrin (90.0-fold), fenvalerate (88.2-fold) and cypermethrin (22.9-fold). There was no evidence of resistance to the organophosphates azinphosmethyl and malathion and the carbamates carbaryl and carbofuran. Even though further investigation is required to determine the mechanism of insecticide resistance, the current results are indicative of target site resistance by means of a kdr-like mechanism in the test insects.

Keywords: DDT; Simulium bonaerense; Simulium wolffhuegeli; pyrethroids; resistance

Document Type: Research Article

Publication date: December 1, 1999

More about this publication?
  • 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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