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Mortality of Nasal Bots in Sheep Treated with Systemic Insecticides1

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Three animal systemic insecticides were given to sheep to determine their effectiveness in reducing larvae (mainly 1st instar) of the sheep bot fly, Oestrus avis L. Nasal sprays of 3% dichlorvos at 2.3 mg per kg administered from pressurized plastic bottles fitted with metered-dose nozzles reduced the numbers of larvae 90%. Oral drenches of fenthion at 30 mg per kg completely eliminated larvae. The same rate of fenthion in feed mixtures and as a pour-on was less effective than oral drenches. Fenthion sprays did not provide any measure of control, probably because of their failure to wet the skin of sheep. Bay 9017 (O,O-diethyl O-[4- (methylthio) -3,5-xylyl] phosphorothioate) was nearly as effective as fenthion.

Document Type: Research Article

Publication date: October 1, 1967

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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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