WSU Tree Fruit Research & Extension Center

Tree Fruit Market Diseases

Sunday, February 17, 2019

WSU-TFREC/Postharvest Information Network/Tree Fruit Market Diseases/pearsanjose

Aspidiotus perniciosus Comstock

San Jose scale can cause serious injury to pear trees if not controlled, because the scale insects attack the bark, foliage, and fruits. Symptoms on the fruits consist of small red spots about 1/8 inch in diameter. A light-colored area in the center of the spot marks the insect's point of attachment to the fruit before the insect was removed. The superficial injury does not affect dessert quality, but it impairs the appearance and results in a lower grade for the fruits.

Scale insects are easily controlled by a proper orchard spray program. Recommendations of the State agricultural extension service or experiment station should be followed.

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