Definition of witches' broom in US English:

witches' broom


  • Dense twiggy growth in a tree caused by infection with fungus (especially rusts), mites, or viruses.

    ‘thirty percent of the crop is destroyed by witches' broom’
    • ‘‘Because the two fungi are related,’ Aime says, ‘biocontrol methods now used to keep witches' broom in check may also work for frosty pod.’’
    • ‘Diseases such as witches' broom, (which leaves pods brown and dry) and black pod (a cousin of potato blight) thrive in the humid climate of the rainforest.’
    • ‘The tropical climates where cacao grows best are also perfect incubators for fungal diseases like black pod, witches' broom, and frosty pod rot.’
    • ‘During the past decade, Brazil's main production area in the state of Bahia has been devastated by a fungal disease called Crinipellis perniciosa, or witches' broom.’
    • ‘His research includes two major goals: understanding genetic diversity of the fungus that causes witches' broom and identifying resistance to the disease.’
    • ‘The audience (read: book fan) is immersed in a fabulous-looking magical world full of goblin bank tellers, super fast witches' brooms and ghosts that show up in the soup.’