potato scab

noun

Definition of potato scab

  1. :  any of various diseases of the potato characterized by crusty rough spots or scabs on the tubers; specifically :  a disease that is characterized by lesions of brownish corky tissue, is caused by an actinomycete (Streptomyces scabies), and is especially damaging in alkaline soils —called also corky scab — compare powdery scab

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