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Fruit Varieties Journal
(Fruit Var J)

American Pomological Society

Volume 38 Number 2 Article 1 Pages: 34-36
Year 1984 Month 4
Title: Observations of Psylla Resistance Among Several Pear Cultivars and Species
Author: H.A. Quamme
Pear psylla, Psylla pyricola Forester is a serious pest of pear trees. Psylla weaken the pear tree through feeding and discolor the fruit by producing honeydew exudate on which sooty mold grows. Severe tree losses can also occur from pear decline which is transmitted by psylla.

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