Walnut tree blight?

Asked June 3, 2018, 1:49 PM EDT

Hi, in the last 3 weeks we’ve noticed these hard spots on our walnut tree leaves. See photos attached. Should this be a concern? If yes, what is the recommended response? Thank you.

Lane County Oregon walnut trees horticulture

1 Response

Thanks for the photos! That looks like the work of the walnut blister mite, which you can read about here...

https://pnwhandbooks.org/insect/nut/walnut/walnut-walnut-blister-mite

Generally no control is warranted.