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Walnut Tree Problem #875080

Asked June 28, 2024, 10:47 AM EDT

I have attached 3 photos of my walnut tree issue. I have two Carpathian Walnut Trees that are approximately 9-10 years old and they have developed these blisters on both trees. (See photos) This is the second year that they have been present and seem to be getting worse. Please advise if there is any treatment to save these trees.

St. Clair County Michigan

Expert Response

Hi Pamela:

It looks like an issue with blister mites. You can read more about them at https://ipm.ucanr.edu/agriculture/walnut/walnut-blister-mite/#gsc.tab=0

The damage looks bad but luckily it is just aesthetic--hopefully it will lessen in the coming seasons if conditions are less desirable for mites.
Best,
Erin
An Ask Extension Expert Replied July 10, 2024, 11:12 AM EDT

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