Baseline Bioassays with Hexythiazox and Clofentezine of Three Mite Species (Acari: Tetranychidae) Occurring on Washington and Oregon Tree Fruits

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Eggs from Panonychus ulmi (Koch), Tetranychus urticae Koch, and T. Mcdanieli McGregor collected from apple and pear orchards in Oregon and Washington were tested with the acaricides hexythiazox and clofentezine to establish baseline responses before the compounds were registered and were widely used in the field. Within mite species, few significant differences were detected among LC50's for populations tested with either compound; differences at this response level ranged from 2- to 5-fold. LC50's were significantly different between species; they were higher for P. ulmi than for either T. urticae or T. Mcdanieli. Although not significantly different, LC50's for both compounds were generally higher for T. Mcdanieli than for T. urticae. LC50's for P. ulmi were three times higher for clofentezine than hexythiazox. For T. urticae, LC50's for both chemicals were similar, but the LC50 for clofentezine with T. Mcdanieli was somewhat lower than the LC50 for hexythiazox. LC50's for hexythiazox for populations of T. urticae collected from apple versus pear and populations collected from Medford, Oreg., versus more northern fruit-producing regions in Oregon and Washington were not significantly different. LC50's for clofentezine were not significantly different for populations of T. urticae collected from apple and pear.

Document Type: Research Article

Publication date: October 1, 1990

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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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