black knot

noun
disease of plum and cherry trees characterized by black excrescences on the branches
Hypernyms: ↑plant disease

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noun
1. : 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

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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.]

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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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