Laboratory and Field Studies on Orchard-Mite Resistance to Kelthane1

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In September of 1958, a few apple growers in Washington re- ported the failure of Kelthane® (1,1-bis(p-chlorophenyl) 2,2,2.. trichloroethanol) in controlling the McDaniel mite, Tetranychus medanieli McGregor. During 1959, this problem occurred in many other apple orc1ull'dsin north central Washington.

When difficulties were first reported, field studies indicated that timing, application, and the amount of active material used were not responsible for the failures, but rather that the mites had developed a resistance. Several other chlorinated hydro- carbon acaricides also failed to control the mites. Laboratory studies confirmed the presence of Kelthane-resistant strains of the McDaniel mite at several locations. One strain from an orchard where control had been especially difficult showed a 200-fold increase in the LD-50 over a susceptible strain.

Laboratory studies with strains of the two-spotted spider mite, Tetranychus telarius (L.), from different areas showed that they were about equally susceptible to Kelthane.

Document Type: Research Article

Publication date: February 1, 1961

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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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