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powdery scab
noun
Definition of powdery scab
: a disease of potato tubers caused by a fungus (Spongospora subterranea) and characterized by nodular discolored lesions which at maturity burst to expose a powdery mass of spores in circular pits surrounded by the lighter colored frayed remnants of the skin of the tuber —called also pock scab
From the M-W Editors
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