Witches-broom meaning

An abnormal brushlike growth of closely clustered shoots or twigs on a plant, often caused by a fungus or virus.
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Any of various plant diseases characterized by such growths, especially a destructive fungal disease of cacao caused by the basidiomycetous fungus Crinipellis perniciosa.
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An abnormal growth of closely bunched, slender twigs at the ends of branches of various woody plants, caused by fungi, viruses, etc.
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