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

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: and

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