Determining Black Walnut Disease - Ask Extension
I've started to see what appears to be a white fungus growing on some of the branches of a black walnut tree in my yard. It's on a few of the lower br...
Knowledgebase
Determining Black Walnut Disease #308090
Asked March 19, 2016, 9:39 PM EDT
I've started to see what appears to be a white fungus growing on some of the branches of a black walnut tree in my yard. It's on a few of the lower branches but has gotten worse over the past year. Is it possible to tell what it is and whether or not it is treatable?
Hennepin County Minnesota
Expert Response
It is hard to tell from photos, but I believe your tree has lichens. This link will describe them. Lichens are not harmful but, in fact, indicate good air. http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/non-harmful-tree-conditions/
