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Apple scab is a fungus disease that can be extremely severe, causing leaf loss, reduced tree vigor, and reduced flowering of crabapples and apples. It is the most common and persistent disease affecting these trees. The most common symptom of apple scab is olive-green spots on the leaves. These spots enlarge, darken and become velvety over time. A leaf with several spots eventually turns yellow and drops from the tree prematurely. Heavily infected trees may be defoliated by mid-summer.