Structure/Activity Relationships of 2-haloalkanoic Acids and Their Esters as Antitermitic Agents Against Formosan Subterranean Termites (Isoptera: Rhinotermitidae)

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Abstract:

Field-collected Formosan subterranean termite, Coptotermes formosanus Shiraki, foragers were exposed for 2 wk to wood slices containing 5,000 ppm of C10-C22 alkanoic and 2-haloalkanoic acids and esters. A feeding reduction index was established to evaluate effects of these compounds on wood consumption by termites. Termites were maintained for 2 wk after treatment on untreated wood to determine mortality. Unhalogenated acids had minimal effect on C. formosanus mortality and wood consumption, but 2-brominated acids were significantly more toxic and diminished feeding. Methyl esters of haloacids had a variable effect on antitermitic activity that may have been related to carbon-chain length. 2-iodooctadecanoic acid and ester treatments were more toxic and less fed upon than comparable 2-bromo compounds, which, in turn, were more active than their 2-chloro analogs. Methyl-, ethyl-, and isopropyl-2-halooctadecanoates were equally or more toxic than their respective haloacids.

Document Type: Research Article

Publication date: April 1, 1987

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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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