blister canker

blister canker

[′blis·tər ‚kaŋ·kər]
(plant pathology)
A fungus disease of the apple tree caused by Nummularia discreta and characterized by rough, black cankers on the trunk and large branches. Also known as apple pox.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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