crown gall

n.
A widespread disease of numerous plants caused by the bacterium Agrobacterium tumefaciens and characterized by formation of galls especially at the junction of root and stem.

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A bacterial disease that infects, weakens, and kills many types of plants. The brown, rough, woody galls, often resembling blackened walnuts, may be present on larger roots near the surface of the soil, as well as on the crown. See also gall.

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The noun has one meaning:

Meaning #1: a bacterial disease of plants (especially pome and stone fruits and grapes and roses) which forms excrescences on the stem near the ground

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