Growth on oak tree #863165

Asked April 02, 2024, 4:13 PM EDT

We have scattered brown/black round, hard growths on our huge oak tree. Can you tell us what they are and what we should do about them. We sure do not want to lose this tree.

Pine County Minnesota

Expert Response

Hi Gail,

You  have Oak Gall which I know looks alarming but it's a pretty harmless condition caused by tiny insects.

There isn't really anything you can do about them but they won't kill your tree.

Sally Granath

Saint Louis County MG

An Ask Extension Expert Replied April 02, 2024, 7:52 PM EDT

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