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Different instars of the fall armyworm, Laphygma frugiperda (J. E. Smith), were exposed to residues of Telodrin® (1,3,4,5,6,7,8,8-octachloro- l,3,3a,4,7,7a-hexahydro-4,7-methanoisobenzofuran). Insecticide residues were determined by gas-liquid chromatography employing electron affinity detection, radiometrically, and by paper chromatography of C14-labeled Telodrin. Volatilization of Telodrin from open bioassay jars was considerable within 8 to 24 hr. The quantity of toxicant required internally to produce mortality could not be precisely determined for first-instar larvae, although the range was 1.19 to 5.59 ppm. The lethal dosage of Telodrin in the integument and internal organs of third-instar larvae was 5.86 to 6.05 ppm, with about 3.5 ppm in the internal organs. There was no correlation between total lipid content and the lethal dose in individual grown larvae, although there was an indication that mortality of grown larvae was directly related to unsaturatcd fat content. No detectable metabolism of Telodrin occurred on or in the 3 larval instars examined under the conditions of these experiments.
Document Type: Research Article
Publication date: February 1, 1965
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.