Any of several different diseases of potatoes producing pits and other damage on their surface, caused by streptomyces bacteria (but formerly believed to be caused by a fungus).
Common scab, a relatively harmless variety of scab (potato disease) caused by Streptomyces scabies.
(phytopathology) Any one of various more or less destructive fungaldiseases that attack cultivated plants, forming dark-colored crustlike spots.
(founding) A slight irregularprotuberance which defaces the surface of a casting, caused by the breaking away of a part of the mold.