Absorption and Metabolism of Dimethoate In the Bollworm and Boll Weevil1

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P32-1abeled dimcthoate was absorbed and exerted rapidly by fifth-instar bollworm larvae >(Heliothis zea (Boddie)) and adult boll weevils (Anthonomus grandis Boheman). These insects absorbed 54.2% and 74.5% of topically applied dimethoate, respectively, after 24 hours and 76.2% of an injected dose of dimethoate was excreted by bollworm larvae after 24 hours. The in viro metabolism of P32-labeled dimethoate in adult boll weevils, fifth-instar bollworm larvae, and cotton seedlings was charaeterized qualitatively and quantitatively though the use of paper chromatography, autoradiography, and standard radio assay procedures. Dimethoate and 11 metabolites were detected in various insect and plant extracts. In bollworms, the principal initial sites for hydrolytic cleavage of the dimethoate molecule were the carbonyl-nitrogen bond and the sulfur-carbon bond The oxygen analog of dimethoate was formed in both plants and insects but was broken down rapidly by the latter to nontoxic products.

Document Type: Research Article

Publication date: April 1, 1963

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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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