crown-gall

crown gall

noun Plant Pathology.
1.
a disease of peaches, apples, roses, grapes, etc., characterized by the formation of galls on the roots or stems usually at or below ground level, caused by a bacterium, Agrobacterium tumefaciens.
2.
the gall itself.

Origin:
1895–1900

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
crown gall

noun
a bacterial disease of plants (especially pome and stone fruits and grapes and roses) which forms excrescences on the stem near the ground 
WordNet® 3.0, © 2006 by Princeton University.
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