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A widespread plant disease caused by Agrobacterium tumefaciens and characterized by the formation of tumorous galls, especially at the junction of root and stem.
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|Noun||1.||crown gall - a bacterial disease of plants (especially pome and stone fruits and grapes and roses) which forms excrescences on the stem near the ground|
plant disease - a disease that affects plants
hairy root - a phase of crown gall (especially in apples) during which there is abnormal development of fine fibrous roots