Dying Aspen Trees
I have a home in Sisters Oregon. The aspen trees are getting a black mold or something all over the trunks. It almost look like they have been burned black. Also some others have a split in the bark that runs 4 or five feet lone. The leaves have not budded out yet so don't know what they look like. Thank you. Lori
Certified GKH Gardening Expert
There are several disease and pests that can cause issues for the Aspen Trees.
It may be Sooty Bark Canker.
The images were not very clear, so this link may have more help for you.
You can also show the image to your local County Extension Office.
Here is a link to help you locate your nearest office.