释义 |
black knot 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 |