WSU Tree Fruit Research & Extension Center

Tree Fruit Market Diseases

Sunday, February 17, 2019

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

Gloeodes pomigena (Schw.) Colby

This superficial but unsightly disease affects pears as well as apples (see Apples, Sooty Blotch). Although infections can occur in the late spring, the disease appears most often on orchard fruits in late summer or early fall during periods of prolonged cool, moist weather. The superficial fungal growth produces dark, granular, smudge-like spots on the fruits that can be easily removed by scraping. Early-season infections on Kieffer pears, however, can penetrate deeply enough to kill epidermal cells and cause dark russeted areas. The disease is controlled by orchard sprays. Recommendations of the State agricultural experiment station or extension service should be followed.

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