Asked August 6, 2019, 5:45 PM EDT
I have something on the leaves of my camperdown elm. Can you tell me what it is and what can be done about it? Many thanks!
Benton County Oregon trees and shrubs
Thanks for your question about Camperdown elm leaf damage. This looks very much like leaf miner damage, but without seeing the pest itself it is impossible to say for sure. Have you seen any sign of tiny caterpillars? If they are leaf miners, they will be between the top and bottom surface of the leaves.
If the damage is not extensive, you may be able to remove the infested leaves, or even shred them when they come down in the fall, as suggested in the PNW Pest Management Handbook https://pnwhandbooks.org/insect/hort/landscape/hosts-pests-landscape-plants/elm-ulmus-elm-leafminer