potato scab

noun

Definition of potato scab

: 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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Learn More About potato scab

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Cite this Entry

“Potato scab.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/potato%20scab. Accessed 19 Oct. 2021.

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