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Decreased Susceptibility of Blackfly larvae1 to p,p'-DDT in New York State and Eastern Canada2,3

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In laboratory tests using jars or buckets, blackfly larvae (Simuliidae: Prosimulium and Simulium spp.) from streams with a history of DDT treatment were 4- to 10- fold less susceptible to DDT than those from untreated streams. Studies comparing the influence of test variables on susceptibility indicated that mortalities were not significantly different if alcohol or acetone were used as solvents for the DDT, if the exposure period was 20 or 30 minutes, or if the larvae were exposed in glass jars containing 3000 ml of water and toxicant or in waxed paper cups with 130 ml of water and toxicant. Aeration of water and DDT during the exposure period increased its toxicity about 10-fold. In all tests the larvae were confined in white organdy bags to facilitate transfer and counting.

Document Type: Research Article

Publication date: February 1, 1970

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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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