Strange growth on leaves. Jacq. Hillier Elm

[Gaitano]

I recently noticed several leaves on my elm had lost color. Upon closer inspection I found vertical growths emerging from the tops of the leaves. Any idea what is causing this?

 

[JudyB]

The are leaf galls. Elms seem to be susceptible to them. Unsightly yes, but no large health concern. I just cut off affected leaves, and have not seen any after effects from them. Some years they are worse than others, this year I have none to speak of.

 

[Gaitano]

That was my guess, but the pictures I saw in one of my books was a bit different. The ever helpful google search produced images similar to what I see. Now that I thought about it, I also noticed this on my peach tree.

Thanks for the help!

 

[MattB]

My Seiju has this issue. I cut them off when I trim. Glad to know its not a major issue

 

[cmeg1]

I have them on my elms this year too.I have read they are harmless,just pluck them off and burn them,though I never burn mine.There is peach leaf curl also on mine.If left on it could weaken the vigor.Same treatment,just pluck off and burn,It comes from spores in the air in spring.