siberian elm leaf problem

Asked June 13, 2018, 4:11 PM EDT

Hi, I've got a siberian elm with what looks like something eating the leaves all over the tree. it's not "lacey" and I don't see any insects. In Golden.
Thanks!

Jefferson County Colorado trees and shrubs

1 Response

Hello,
This serpentine damaged is caused by the larvae of the Elm Leafminer (Kaliofenusa ulmi), a tiny wasp that lays its eggs in the leafs of Elm cultivars. The leaf mining is aesthetic only, and does not damage the tree. https://bspm.agsci.colostate.edu/files/2013/03/Elm-Leafminer.pdf

Best regards,