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witches' broom

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Definition of witches' broom in English:

noun

[mass noun]
Dense twiggy growth in a tree caused by infection with fungus (especially rusts), mites, or viruses: thirty per cent of the crop is destroyed by witches' broom [count noun]: those big untidy bunches of twigs called witches' brooms
More example sentences
  • His research includes two major goals: understanding genetic diversity of the fungus that causes witches' broom and identifying resistance to the disease.
  • The tropical climates where cacao grows best are also perfect incubators for fungal diseases like black pod, witches' broom, and frosty pod rot.
  • ‘Because the two fungi are related,’ Aime says, ‘biocontrol methods now used to keep witches' broom in check may also work for frosty pod.’

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