My sister and I looked into this, and with the information gleaned from the AHDB Horticulture and Potatoes website have concluded that it's probably Powdery scab (Spongospora subterranea) or most likely Black dot (Colletotrichum coccodes), a fungus. While Black Dot is a mild disease it is also one of the most problematic blemish diseases of washed, pre-packed potatoes.
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My sister and I looked into this, and with the information gleaned from the AHDB Horticulture and Potatoes website have concluded that it's probably Powdery scab (Spongospora subterranea) or most likely Black dot (Colletotrichum coccodes), a fungus. While Black Dot is a mild disease it is one of the most problematic blemish diseases of washed, pre-packed potatoes.
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