Spray anti-bacterial products. Most are physiologically harmless to the tree. Control is very difficult to attain and is often unnecessary. Otherwise, prune and destroy clippings. Dark gray in color.
Mold begins from inside the plant and moves outward.
Insect on under side of leaf. During early spring, about the time the leaves reach full size, light green areas appear on them, with the affected area raised on the upper and depressed on the lower leaf surface. Later these spots die and turn brown. The disease usually does no great damage to oaks other than unattractiveness of the brown spots over the leaves. Laurel Oaks, Willow Oak, and Shumard Oak.