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Extension > Yard and Garden News > Birch Erineum Gall

Wednesday, June 30, 2010

Birch Erineum Gall

Jeffrey Hahn, UMN Extension Entomologist

bircherineum.JPG
Birch erineum gall
Jeff Hahn
Some birch trees are exhibiting red, fuzzy patches on some of their leaves. It is common to assume that this is a type of disease but it is actually a type of gall. Galls are abnormal plant growths due to a variety of different organisms. In this case is caused by a species of eriophyid mite. Eriophyid mites are very tiny and nearly microscopic. This gall is similar to ones found on maple, viburnum, and linden. Like other insect and mite leaf galls, birch erineum galls have very little, if any, impact on tree health. You do not have to do anything if you find this gall in your tree, just ignore it.



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