witches'-broom

(wic̸h′iz bro̵̅o̅m′)

noun

an abnormal growth of closely bunched, slender twigs at the ends of branches of various woody plants, caused by fungi, viruses, etc.

See witches'-broom in American Heritage Dictionary 4

noun

An abnormal brushlike growth of weak, closely clustered shoots or branches on a tree, such as the hackberry, caused by fungi or viruses.

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