Rate of Penetration and Residual Toxicokinetics of Carbaryl on Southern Pine Betle and Spruce Beetle (Coleoptera: Scolytidae)


Source: Journal of Economic Entomology, Volume 88, Number 3, June 1995 , pp. 543-550(8)

Publisher: Entomological Society of America

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Carbaryl-naphthyl-1-14C (1-naphthyl methylcarhamate) was topically applied in acetone to the prothorax of adult southern pine beetle, Dendroctonus frontalis Zimmermann, and spruce beetle, D. rufipennis (Kirby). The rate of penetration of carbaryl into both species is best described by an open, two-compartment model. The residual toxicokinetics model was established to compare the biphasic rate of penetration of carbaryl within these beetles. The estimated exoskeleton residual half-life of the slow phase (phase 11) for the southern pine beetle was 90 h or 13 times that of the spruce beetle (7 h). At 8 h, the accumulation of radioactivity intel11ally for the spruce beetle was almost double the amount for the southern pine beetle. The amount of methanolic un extractable compounds was similar for both beetle species; unextractable compounds increased as incubation times increased. LD50 levels for carbaryl indicated that the spruce beetle was more susceptible to carbaryl than the southern pine beetle. This information and results of the toxicity tests suggest that decreased exoskeletal penetration may be one of the major mechanisms of southern pine beetle tolerance to carbaryl.

Document Type: Research Article

Publication date: June 1, 1995

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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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