Influence of Insecticide Mixtures Impregnated in Cattle Ear Tags for Management of Pyrethroid-Resistant Horn Flies (Diptera: Muscidae)

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Ear tags impregnated with a mixture of cyhalothrin-piperonyl but oxide- DEF (S,S,S,-tributyl phosphorotrithiolate)or cypermethrin-piperonyl butoxide-chlorpyrifos were evaluated for the management of pyrethroid-resistant horn flies, Haematobia irritans (L.),on cattle in Kentucky.At the time of treatment, all horn fly populations were resistant to the pyrethroids in these mixtures. Although acceptable control of horn flies (average > 92%) was generally achieved on treated animals, LC50s for the pyrethroid mixture tested on each population were 2-33 times greater after 14 wk exposure compared with values before treatment. At the end of this exposure period, the frequency of pyrethroid- resistant individuals remaining in each of the treated horn fly populations was 100%.

Document Type: Research Article

Publication date: April 1, 1993

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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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