Cherry leaf spot

Cherry leaf spot

Blumeriella jaapi (Rehm) Arx


Lesions begin as small, circular red to purplish spots on the upper leaf surface (A). Spots enlarge as they grow older, typically coalescing and turning brown (B). Lesion centers may eventually drop out to give the leaf a "shot-hole" appearance, particularly on plum. The most striking symptom of cherry leaf spot, especially on sour cherry, is the yellowing of older leaves prior to their falling from the tree (C). When infection is severe, the entire tree may be defoliated by midsummer. Spores are produced on the underside of leaf lesions in acervuli and appear as a white to pinkish mass in the center of the lesion (D).

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