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Oak trees #939538

Asked July 16, 2026, 8:41 PM EDT

What is happening to my oak trees?

Cass County Minnesota

Expert Response

Thanks for the question. 

Your oak trees are obviously stressed. From your photos it looks like you may have two-lined chestnut borers.  Your trees can be treated for this.

I recommend that you have a tree care professional come out to evaluate them and give you a recommendation. Only in person can they be sure what is going on here.

https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional

https://hort.extension.wisc.edu/articles/two-lined-chestnut-borer/

Deb Reierson Replied July 18, 2026, 11:39 AM EDT

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