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Reproductive Diapause and Host Plants Affect Insecticide Tolerance of Adult Pear Psylla (Homoptera: Psyllidae)

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Winter form pear psylla, Cacopsylla pyticola Foerster, in reproductive diapause and collected in the fall were conditioned in the laboratory to either tenninate (long days) or maintain (short days) diapause; conditioning was further divided into insects fed on dormant budwood or pear foliage. Long days promoted ovarian development; this development was enhanced by feeding on foliage compared with domlant wood. Pesticide tolerance was reduced in long day-conditioned pear psylla after diapause compared with those kept in diapause in five of six experiments. Conditioning of host plants also effected pesticide tolerance in two of five experiments. Our results suggest that the known reduction in pesticide tolerance of winterform pear psylla from fall to spring was related to diapause status and not linear age; diapause status, in tum, was affected by host plants. A general decline in control survivorship was correlated with reduced pesticide tolerance after diapause.

Document Type: Research Article

Publication date: August 1, 1994

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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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