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Black Dot Disease of Potatoes

Tuber infection appears as brownish to gray discoloration over a large protion of the tuber (as seen above) or as roundish spots often larger than 1/4 inch in diamter.

Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY

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Link to the Factsheet on Black Dot Disease of Potatoes

Link to Photo Gallery of Black Dot Disease of Potatoes