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Pycnidia (white) and spore masses (amber) of Cytospora canker on prune.

The white bumps are protruding pycnidia of the Cytospora canker pathogen, Cytospora leucostoma. Amber-colored spore masses are exuding from the openings of some pycnidia; Sutter Co. Credit: Jack Kelly Clark — Credit: Jack Kelly Clark

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