black knot

noun

Definition of black knot

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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Cite this Entry

“Black knot.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/black%20knot. Accessed 28 Jan. 2022.

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