English Oak #833453

Asked June 02, 2023, 7:55 PM EDT

My English oak is starting to get brown spots on the leaves. Can you please advise what you think is happening?

Eaton County Michigan

Expert Response


This appears to be oak leaf blister, which occurs in cool wet spring weather.

To get the opinion of a Plant Pathologist please email your pictures to MSU Plant and Pest Diagnostic lab.

Email them to <personal data hidden>

Here is a description and pictures of common issues on oak, and an article on oak leaf bilster-

In the meantime, keep the tree watered, watering from below so as to keep leaves dry. ( This is good practice for all plants, because long standing wet leaves encourages fungi of all sorts to grow) If you can’t water from below, be sure to water early in the day so leaves dry quickly and before sunset.

Thank you for your question! Replied June 02, 2023, 8:58 PM EDT

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