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Susceptibility of Cacopsylla pyri and C. pyricola (Homoptera: Psyllidae) to Avermectin B1 Applied Topically and as Residues on Pear Foliage

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Effects of avermectin B1 were determined by topical application for Cacopsylla pyri (L.) adults in Europe and by exposure to treated pear foliage for C. pyricola (Foerster) adults and nymphs in North America. Data were obtained for mortality and egg production by survivors. With C. pyri, probit regressions for males and females were similar, summer adults were more susceptible than winter adults. Age of summer adults at treatment did not affect slope, and mortality associated with time between treatment and evaluation increased linearly up to 72 h. Avermectin BI reduced average daily oviposition and total egg production in C. pyri. Oviposition rate was affected more in summer females than in winter females. Slopes for dose- and concentration-mortality data were similar for the two species with the two exposure techniques. The technique of exposing nymphs to treated pear leaves was also used to measure residual activity of avermectin B1 in pear foliage. Applications at 7.5 mg/liter produced Comparable mortalities for ≈1 wk longer than did half that concentration. Data derived from these tests can serve as baselines for detecting changes in susceptibility of psyllid populations, and techniques reported here could be used to detect resistant populations. Implications of these data to the development of a use strategy for avermectin BI against psyllids attacking pear are presented.

Document Type: Research Article

Publication date: February 1, 1992

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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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