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Acaricide AC 84,633: First Trials for Control of Boophilus microplus

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A new acaricide, American Cyanamid AC 84,633 (Imidocarbonic acid, (4-chloro-o-tolyl)-dithio-, cyclic methylene ester) inhibited oviposition and reduced egg hatchability in in vitro tests with the southern cattle tick. Unfed larvae were paralyzed but not killed by concentrations up to 64000 ppm. In 2 experiments conducted on stalled cattle experimentally infested with either an organophosphate-susceptible or resistant strain of B. microplus, minimum control was 99.6 and 99.8%, respectively, from spray concentrations of 454 and 500 ppm of AC 84,633. Cattle with heavy experimental infestations were maintained under field conditions after a single spray or dip treatment. From days 2–21, mean tick mortality was 92.4% on cattle sprayed with 500 ppm and 95.7% on cattle dipped with 464 ppm. From 5–21 days, mean tick control was 97.7 and 99.7% for sprayed and dipped cattle, respectively. The foregoing results were confirmed during large-scale dipping trials on farms with histories of difficult tick control.

Document Type: Research Article

Publication date: June 1, 1974

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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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