A witch`s broom or witches` broom is a disease or deformity in a woody plant, typically a tree, where the natural structure of the plant is changed. A dense mass of shoots grows from a single point, with the resulting structure resembling a broom or a bird`s nest. Witch-broom disease caused by phytoplasmas is economically important in a number ......
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http://en.wikipedia.org/wiki/Witch`s_broom
Abnormal broom-like growth or massed proliferation caused by the dense clustering of branches of woody plants.
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http://www.encyclo.co.uk/visitor-contributions.php
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