Witch's broom on downy birch, caused by the fungus Taphrina betulina

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Witch's brooms on downy birch, caused by the fungus Taphrina betulina. 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.

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Photo credit: © VBrockhaus / Alamy / Afripics
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Keywords: betulina, birch, broom, caused, disease, donnerbusch, donnerbüsche, downy, fungus, hexenbesen, plant, structure, taphrina, witch, witchbroom, witchs