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Growth on Tree leaves #329468

Asked June 06, 2016, 6:52 PM EDT

I was hiking yesterday and saw weird bumps on the leaves of several trees. Do you know these are?

Washington County Maryland

Expert Response

These weird bumps are galls, which you do not need to worry about. http://extension.umd.edu/hgic/shade-tree-galls vw

Answered by the Home & Garden Information Center's Maryland Certified Professional Horticulturists Replied June 07, 2016, 11:01 AM EDT

This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

Growth on Tree leaves #329468

Expert Response

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