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Black Dot Disease of Potatoes

Acervuli produce characteristic dark, needle-shaped spines, or setae (photo above) and give rise to spores (conidia) (see next photo for picture of conidia)

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