the world > plants > disease or injury > 			[noun]		 > type of disease > caused by insects > associated with crop or food plants > scab (3)		
A disease of cultivated plants, due to vegetable parasites, and causing scab-like roughness.
any of various actinomycete bacteria which produce brown patches, pits, or swellings on the surface of potatoes; esp. (more fully common potato scab)…
= potato scab n. at potato, n. compounds 2. Australian.