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Effects of Mixtures of Bacillus thuringiensis and Pesticides on Plutella xylostella and the Parasite Thyraeella collaris

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Dipel®, a commercial formulation of Bacillus thuringiensis Berliner, was combined with 7 pesticides, and their effects against 3rd instars of Plutella xylostella (L.) were determined by using a leaf-dip method. Binapacryl, tricyclohexyltin hydroxide, chlordimeform, and fentin hydroxide synergised B. thuringiensis by factors of 5.5, 4.2, 4.2, and 3.7, respectively, at the LC50 level; demeton-S-methyl and dimethoate were highly antagonistic. When the synergistic mixtures were tested against Thyraeella collam Gravely, a parasite of P. xylostella, those containing binapacryl, tricyclohexyltin hydroxide, and fentin hydroxide were not toxic; the chlordimeform mixture displayed some vapor and stomach activity but no contact toxicity.

Document Type: Research Article

Publication date: February 1, 1977

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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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