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Toxicity of Avermectin B1 Against a Susceptible Laboratory Strain and an Insecticide-Resistant Strain of Plutella xylostella (Lepidoptera: Plutellidae)

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Avermectin B, (AVMB,) is a relatively slow-acting (96 h) pesticide whose activity appears to be independent of temperature (15-25). By topical application, AVMB, was more toxic than cypermethrin, malathion, or DDT against a standard susceptible laboratory strain of Plutella xylostella L. and a field (Thailand) strain resistant to a number of insecticides. When applied in ethyl methyl ketone (technical grade) or as a diluted emulsified concentrate (113MI2, 1.8% EC), AVMB, was 26-fold more active against the laboratory strain. However, when safflower or Sunspray 6E oil was added to the 113M12 formulation, or when technical AVMB, was applied in an aqueous-acetone mixture with Triton X-100, the difference between the two strains was less (17-, 6-, and 8-fold respectively). Piperonyl butoxide increased the toxicity of technical AVMB, to the field strain by 2-fold. In foliar contact-ingestion and ovicidal tests, the differences in susceptibility to AVMB, (113M12) between the two strains were also less (13- and 3-fold, respectively). These differences in sensitivity to AVMB, may have been due to vigour tolerance of the field strain in comparison with the laboratory strain and to a very low level of cross-resistance in the former. With the laboratory strain, AVMB, was considerably more active than cypermethrin on foliage against fourth instars (100-fold), whereas cypermethrin was 14-fold more toxic than AVMB, against eggs. The ovicidal activity of AVMB1 (113M12) against both strains was enhanced by the addition of oils.

Document Type: Research Article

Publication date: December 1, 1988

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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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