Pear Psylla: Relationship of Early-Season Nymph Densities to Honeydew-Induced Fruit Damage on Two Pear Cultivars

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The relationship of early-season densities of nymphs of Psylla pyricola Foerster to honeydew-induced fruit russet was measured on D'Anjou and Bosc pear cultivars in southern Oregon. Overall, fruit injury ratings based on percent downgrading caused by psylla honeydew indicated D'Anjou to be ca. fivefold more susceptible to damage induced by equivalent nymph densities than Bosc. An average nymph density of 1.0 per leaf resulted in ca. 2.5 and 17% downgrading on the Bosc and D'Anjou varieties, respectively. This difference was attributed to the nature of the pear cultivars, with damage being more apparent on the clear skinned D'Anjou compared with that on the normally russeted Bosc.

Document Type: Research Article

Publication date: October 1, 1981

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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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