Dense twiggy growth in a tree caused by infection with fungus (especially rusts), mites, or viruses.
（因真菌，尤指锈菌、螨或病毒引起的）丛枝病，扫帚病
thirty per cent of the crop is destroyed by witches' broom
count nounthose big untidy bunches of twigs called witches' brooms
Example sentencesExamples
His research includes two major goals: understanding genetic diversity of the fungus that causes witches' broom and identifying resistance to the disease.
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.
The tropical climates where cacao grows best are also perfect incubators for fungal diseases like black pod, witches' broom, and frosty pod rot.
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.
‘Because the two fungi are related,’ Aime says, ‘biocontrol methods now used to keep witches' broom in check may also work for frosty pod.’
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.
Definition of witches' broom in US English:
witches' broom
noun
Dense twiggy growth in a tree caused by infection with fungus (especially rusts), mites, or viruses.
（因真菌，尤指锈菌、螨或病毒引起的）丛枝病，扫帚病
thirty percent of the crop is destroyed by witches' broom
count nounthose big untidy bunches of twigs called witches' brooms
Example sentencesExamples
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.
His research includes two major goals: understanding genetic diversity of the fungus that causes witches' broom and identifying resistance to the disease.
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.
The tropical climates where cacao grows best are also perfect incubators for fungal diseases like black pod, witches' broom, and frosty pod rot.
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.
‘Because the two fungi are related,’ Aime says, ‘biocontrol methods now used to keep witches' broom in check may also work for frosty pod.’