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Odd growths on burr oak #846533

Asked August 20, 2023, 6:18 PM EDT

A burr oak near my house has these odd growths on it. Can you identify them?

Anoka County Minnesota

Expert Response

They are oak galls they are made by insects. They are harmless.
https://entomology.ca.uky.edu/ef408

Evelyn Locke, MN Master Gardener, Tree Care Advisor, Volunteer Replied August 20, 2023, 7:40 PM 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.

Odd growths on burr oak #846533

Expert Response

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