scab : Idioms & Phrases
Crown scab
(Far.) , a cancerous sore formed round the corners of a horse's hoof.
Webster 1913
potato scab bacteria
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noun cause of a potato disease characterized by brownish corky tissue
Streptomyces scabies.
WordNet
russet scab
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noun rhizoctinia disease of potatoes
stem canker; rosette; little potato.
WordNet
wheat scab
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noun a disease of the heads of wheat plants