Knowledgebase

What's wrong with my tree? #806123

Asked August 13, 2022, 9:14 PM EDT

Theres these things on my oak tree leaf.

Ramsey County Minnesota

Expert Response

These are oak galls formed by tiny insects/mites.  They generally do not harm trees.  Getting rid of leaves when they fall may decrease the number you see; but they will likely continue from year to year.  See the websites for additional information.
1. https://extension.umn.edu/yard-and-garden-insects/insect-and-mite-galls
2. https://hortnews.extension.iastate.edu/2010/8-25/oakgalls.html
Marykay Haas Replied August 13, 2022, 9:41 PM EDT

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