Asked May 2, 2019, 1:21 PM EDT

I found these "galls" on my oak bonsai on April 10th. I'd like to know if I need to worry about them coming back. You can see the end of the branch they were on was dead. It's a little bonsai and can't afford to lose any more branches. These galls are about the size of a bb.

Washington County Oregon

1 Response

Thank you for your question. These are galls, and are caused by a wasp. Many galls are harmless, and I don’t know what type you have. Here is an Extension article on them: Here’s another article with limited control options: Good luck!