Mountain Ash question

Asked September 25, 2014, 2:30 PM EDT

Found a white spot on my mountain ash. What's happening to it?

Rice County Minnesota trees and shrubs horticulture

1 Response

Unfortunately fungus has entered a wound on your mountain ash. Pruning wounds, cracks, leaf scars, sunscald lesions, winter-injured areas, and senescent branches are all good entry sites for the fungus.