Absorption and Toxicity of Three Radioactive Insecticides in Larvae of Two Species of Mosquitoes1

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Acetone-water suspensions of solutions of radioactive DDT, Bayer 21/199, and Am. Cyanamid 12880 [O,O-dimethyl S- (N-methylcarbamoylmethyl)- phosphorodithioate] were tested against fourth-instar Anopheles quadrimaculatus Say and Aedes taeniorhynchus (Wied.) larvae [Culicidae:Diptera]. Concentrations required for equivalent 24-hour mortality were in the order of DDT<21/199<12880. A. quadrimaculatus were more sus- ceptible to DDT and 12880 but less to 21/199 than taeniorhync hus; however, at the LD-50 only small differences (0.0033- 0.0142 üg/larva) were seen between species and chemicals. Increasing the number of quadrimaculatus larvae per unit volume resulted in lower mortalities with DDT, but no change with 21/199 and 12880. A. quadrimaculatus larvae exposed to 21/199 for 48 hours absorbed a maximum amount in the first few hours but the mortality increased with time. When quadrimaculatus larvae were transferred to clean water, 73% of the acquired dosage of 21/199 was excreted in 12 hours. Live larvae of both species absorbed more 21/199 than did dead larvae.

Document Type: Research Article

Publication date: October 1, 1958

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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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