Full Member
Posts: 29
Joined: Tue Aug 11, 2015 1:40 am
Location: Markham, Ontario (Canadian zone 6a)

Someone's making homes in my American Elm leaves

Hi everyone

Any chance you know what this is?


There are tiny little worms inside, looks like they might have legs but I can't really see. But I accidentally noticed the big round thing on my finger as I was trying to make a photo:


There were also some (very few) small crystal clear balls inside the bad leaves. I don't know if they're all the same thing. Is it a caterpillar? Are they going to kill my tree? I just planted it. Should I try to do something about them?

Thanks in advance.

Greener Thumb
Posts: 806
Joined: Tue Nov 09, 2010 5:34 pm
Location: Brownville, Ne

Re: Someone's making homes in my American Elm leaves

It looks like galls formed by insects. Usually this does not harm the tree. Here is a better explaination: ... ite-galls/
Paul F

Return to “Trees, Shrubs, and Hedges”