Aspen Sapling Defoliation

Asked September 17, 2018, 6:50 PM EDT

Aspen Saplings are being defoliated by SOMETHING!
I cannot see an insect or anything on the tree.
See photo below.

Pitkin County Colorado defoliation aspen aspen defoliation

1 Response

Thanks for using the Ask an Expert service!

Do you see any leaves at the base of the sapling? Or are they completely gone?
Could you send a closeup of the ends of some of the newly defoliated stems? Is there any damage at the base of the leaf?

My first hunch would be that you have a vertebrate pest that is eating the leaves, and putting a cage that protects the length of the sapling would be a good way to prevent further damage.

Thanks,