Proliferation of many shoots near the end of a branch in response to the death of the terminal bud

witches' broom (Wikipedia)

For the Witch's Broom Nebula

Witch's brooms on downy birch, caused by the fungus Taphrina betulina
Witch's broom on a white pine.

Witch's broom or witches' broom is a deformity in a woody plant, typically a tree, where the natural structure of the plant is changed. A dense mass of shoots grows from a single point, with the resulting structure resembling a broom or a bird's nest. It is sometimes caused by pathogens.

Witch-broom disease caused by phytoplasmas is economically important in a number of crop plants, including the cocoa tree Theobroma cacao,

jujube (Ziziphus jujuba) and the timber tree Melia azedarach.

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