Black spots on tree bark

Asked December 26, 2019, 6:29 PM EST

Several of my trees have these black spots on them. Can you tell me what it is? And is it a problem? Please and thank you!

Washington County Maryland trees and shrubs disease issues trees hypoxylon canker black spots on tree trunk

1 Response

This appears to be hypoxylon canker, a fungal disease. It's problematic in the long run.

Here are a few links about it from Extension: https://www.uaex.edu/environment-nature/forestry/health/SUL11.pdf and
https://hgic.clemson.edu/factsheet/oak-diseases-insect-pests/

You might want to do an image search online for hypoxylon canker to find images like what you're seeing on your tree.

Ellen