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Occurrence of Pyrethroid Resistance in Pear Psylla (Homoptera: Psyllidae) Populations from Southern Ontario

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Adult pear psylIa, Cacopsylla pyricola Foerster, from the Niagara peninsula of Ontario were tested for susceptibility to pyrethroid insecticides from 1980 to 1989. A Potter spray tower was used. Results of tests at IS, 22, and 30" indicated a negative temperature-toxicity relationship for permethrin and fen vale rate. Resistance to pyrethroids (first discovered in 1986 at levels of approximately 50-fold for permethrin at the LC"3) has become widespread in the Niagara region. Resistance extends to all types of pyrethroids but is highest to fenvalerate (approximately 140-fold). Combinations of permethrin and potential synergists piper only but oxide or DEF did not increase the toxicity to resistant populations, suggesting that resistance was due to an insensitive target site or kdr-Iike mechanism. In one resistant population studied over 4 yr without further selection with pyrethroids, resistance declined from 54-fold to approximately 3D-fold after 1 yr and stabilized at 20-30-fold.

Document Type: Research Article

Publication date: December 1, 1990

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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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