Tree fungus?

Asked March 25, 2020, 10:54 PM EDT

Hello! I have a tree close to the house that has developed something over the last couple of years. Not sure what kind of tree it is, but it is a fast growing tree with dark purple leaves all year. I have attached a picture of the fungus? it has developed. The fungus is black and hard and makes the branches brittle. I cut most of it off this year but cannot reach up to the top to get it all. Probably a 30’ tree.

Linn County Iowa

1 Response

The tree is likely a chokecherry. There are two cultivars (Canada Red and Schubert) of chokecherry that have purple leaves.

The growth on the branches is likely black knot. Black knot is common on chokecherries. An article on black knot can be found at