What to do with fungi on an old apple tree

Asked November 8, 2017, 6:40 PM EST


Fungi started to grow on our old apple tree. What are these? Are they harmful to the tree? Is there a good way to get rid of them without using pesticide?

Thank you very much for your assistance.

Boulder County Colorado trees and shrubs

2 Responses

Thank you for the pictures. I would feel more confident seeing the fungus in person but it looks like Trametes versicolor, otherwise known as turkey tail fungus. While we don't typically have a lot of fungus problems on apples in Colorado because of the arid climate, it is possible on old trees and trees that have not been pruned properly. Pruning should always take place at the branch collar and be cut at an angle that will not hold standing water. Without looking at the full tree, it is hard to see for sure but it looks like the fungus is in areas that were pruned.These areas can be treated although not fully contained with a fungicide. If this is a tree that you want to try to keep, I would recommend having a certified arborist come out to take a look and evaluate the overall health of the tree.

Thank you for your advice. We will find a certified arborist in the area and get it pruned properly. Thank you again for your assistance.