All trees are susceptible to fungus. Some trees Tend to deal with fungus more often than others (aspens, blue spruce, pines, pinions, fruit). Certain types of discoloration in foliage are normally the easiest way to identify fungal problems. We have treatments to help protect and correct fungus problems. As with all tree problems it is always easier to prevent and protect problems than trying to correct them once the tree is infested.