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Toxicities of DDT, chlorpyrifos, and fenthion to Cyprinotus incongruens Ramdohr and Chlamydotheca arcuata Sars were evaluated in laboratory cultures. For the 1st species, the series from most to least toxic was chlorpyrifos, fenthion, DDT; and for the 2nd species, it was chlorpyrifos, DDT, and fenthion. Data for 24 h were inadequate to predict field effects because mortalities in test plates increased each day, even at concentrations where no 24-h mortalities were recorded. Temperature stress which would be likely to occur in early spring and in late summer (5 and 35°C) increased insecticide toxicities at a given concentration; lowest mortalities occurred at intermediate temperatures (15 and 25°C). There is some tendency towards induction of egg-laying in these 2 species by toxic doses of the insecticides; the effect is even more pronounced in Cypridopsis vidua O. F. Muller. At all intermediate doses, some fraction of the eggs hatched and matured, which could be a mechanism for reestablishment of populations, but at the highest DDT doses (5.0 ppm) 0 eggs hatched.
Document Type: Research Article
Publication date: February 1, 1974
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.