black knot
A plant disease caused by Dibotryon morbosum, producing rough black growthsA plant disease caused by Dibotryon morbosum, producing rough black growths.
Meaning
1 senses(uncountable)A plant disease caused by Dibotryon morbosum, producing rough black growths.
More definitions
- disease of plum and cherry trees characterized by black excrescences on the branches
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable