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Witch's Brooms are masses of densely branched small twigs found amongst the branches of trees and said to resemble a witch's broom. They can be induced by various parasites including the fungus Taphrina betulina which affects Birch trees. However, these growths may be caused by other different types of organisms, including other fungi, oomycetes, insects, mistletoe, dwarf mistletoes, mites, nematodes, phytoplasmas, or viruses and they are not yet fully understood. For this reason all Taphrina betulina records added to NatureSpot should be submitted as 'Likely'.
Found on birch, particularly Downy Birch and Silver Birch
All year round.
The broom growths may last for many years, typically for the life of the host plant.
Common and widespread in Britain.
Fairly frequent in Leicestershire and Rutland.
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