Surveys of Leafhoppers (Homoptera: Cicadellidae) and Pear Psylla (Homoptera: Psyllidae) in Pear and Peach Orchards and the Spread of Peach Yellow Leaf Roll Disease

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Leafhoppers in peach orchards and adjacent pear orchards in an area of epidemic spread of peach yellow leaf roll (PYLR) disease in northern California were surveyed in 1980 and 1981 to search for faunal differences that might explain why PYLR in peaches is so closely related to the proximity of pear orchards. The leafhopper, Colladonus montanus (Van Duzee), was not common in either peach or pear orchards but was the most frequently trapped insect known to be an X-disease vector. There were no correlations between the number of leafhoppers caught on sticky traps and subsequent PYLR, but adequate statistical analysis was not possible because of the low numbers of known vector leafhoppers trapped and the uncertainties in relating catches in sticky traps to absolute estimates. There was a significant correlation between catches or limb-jarring samples of pear psylla, Psylla pyricola Foerster, in peaches and the subsequent incidence of PYLR. Pear psylla were not detected in peaches until September, after which they dispersed in large numbers from pear into adjacent peach orchards.

Document Type: Research Article

Publication date: December 1, 1984

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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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