black knot

noun

Definition of black knot

  1. 1 :  a destructive disease of plum and cherry trees characterized by black excrescences on the branches and caused by a fungus (Dibotryon morbosa)

  2. 2 :  a destructive disease of the gooseberry characterized by black excrescences on the branches and caused by a fungus (Dibotryon ribesia)

  3. 3 :  a disease of the filbert and hazel characterized by black warty excrescences on the bark and caused by a fungus (Cryptosporella anomala)

  4. 4 :  a cane infection of the grape caused by the crown-gall bacterium

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