Ash Tree Leaf Mystery

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Starsania

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Might someone be able to tell me what is going on with these leaves?
These bumps are on ash tree leaves. I would like to know what this would be called. Answers are much appreciated! ^_^
 
Ash leaf gall mite (or a close cousin to that). Cosmetic damage only. No need to worry.

The bumps are distortions caused by a chemical that the mite injects into the leaf.

You can reduce the numbers of galls by raking and destroying the leaves each fall.
 
That is what I was going to say also (Aceria chrondriphora). I agree on the treatment also...rake up and destroy fallen leaves to control further infestation.

Otherwise, information I see is that it does not affect tree vitality.

Sylvia
 

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