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Effects of Additives on the Toxicity of Pyrethrins to Stable Flies and Horn Flies1

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Abstract:

Formulations containing various combinations of R-ll (2.3.4.5-bis(Δ2-butylene)-tetrahydrofurfural), R-326 (di-n-propyl isocinchomeronate). MGK 264® (n-(2-ethylhexyl)-5- norborneue-2,3-dicarhoximide), Tabutrex® (dibutyl suceinate), butoxy polypropylene glycol, and piperonyl butoxide with 0.02% pyrethrins and without pyrethrins were much less effective against stable flies (Stomoxys calcitrans (L.)) and horn flies (Haematobia irritans (L.)) than 0.1% pyrethrins witbout additives. When sprayed on a single animal, effectiveness of treatments appeared to be more greatly influenced by the quantity of pyrethrins in the formulation than by the presence or absence of additives. In topical-application tests the toxicity of pyrethrins to stable flies was slightly enhanced by the addition of either 10 X or 3.33 X piperonyl butoxide but not by the addition of MGK 264. Evidently, pyrethrins are more difficult to synergize against stable flies and horn flies than against house flies (Musea domestica L.).

Document Type: Research Article

Publication date: October 1, 1963

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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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