Knowledgebase
Autumn Blaze Maple tree #875848
Asked July 03, 2024, 3:50 PM EDT
St. Louis County Minnesota
Expert Response
Yes, these look like Maple galls caused by a mite. They are cosmetic in nature and will not affect the health of your tree.
You don’t have to do anything. Mites are everywhere so there is no avoiding them.
https://hort.extension.wisc.edu/articles/maple-gall-mites-eriophyidae/