Mildew White fungal growth develops on the surface of leaves in the autumn. This disease develops so late in the year, no significant damage occurs. No control is recommended. Where trees are being readied for fall sale, apply azoxystrobin, triadimefon or myclobutanil. Most oaks but especially red oaks are susceptible.
White oaks tend to be resistant.
Leaves at the top of the tree turn brown along the tips and margins, wilt, and soon begin to fall while there is still some green color left in them. This progresses down the tree. Twigs and branches die. Brown streaks often observed in the outer sapwood is sometimes difficult to find. Trees usually die within one year after infection.