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

Author： Westigard P. H.   Allen R. B.   Gut L. J.  

Publisher： Entomological Society of America

ISSN： 1938-291X

Source： Journal of Economic Entomology, Vol.74, Iss.5, 1981-10, pp. : 532-534

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