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Witches broom.

It is a symptom of woody plants where compact clusters of numerous twigs and branches are formed. The mass of shoots comes from a common point, giving a broom-like appearance. The witches broom may last several years. Although some people consider witches broom unsightly, serious injury seldom results. Witches brooms can be caused by various sources including mites, viruses, fungi, mistletoes, insects, and nematodes. Knowing the type of host plant can help determine the cause of the witches broom..

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Q: What causes a clump of branches in a pine tree to form a ball or very dense growth in the shape of a sphere?
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