- noundisease of plum and cherry trees characterized by black excrescences on the branches• Hypernyms: ↑plant disease
* * *noun1. : a destructive disease of plum and cherry trees characterized by black excrescences on the branches and caused by a fungus (Dibotryon morbosa)2. : a destructive disease of the gooseberry characterized by black excrescences on the branches and caused by a fungus (Dibotryon ribesia)3. : a disease of the filbert and hazel characterized by black warty excrescences on the bark and caused by a fungus (Cryptosporella anomala)4. : a cane infection of the grape caused by the crown-gall bacterium
* * *Plant Pathol.a disease of plants, esp. of plums and cherries, characterized by black knotlike overgrowths on the branches, twigs, etc., caused by a fungus, Dibotryon morbosa.[1835-45, Amer.]
* * *black knot,a destructive disease of fruit trees, characterized by large, black, knot-like growths on the branches, caused by a fungus.
Useful english dictionary. 2012.
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