The disease is most serious in wet seasons. Use sprays of basic copper sulfate. A large number of fungi cause leaf spots but are usually not serious. Rake up and dispose of infected leaves. Chemical controls are usually not warranted.
Powdery mildew coats leaves with white powdery growth.
Spraying may not be needed. Use benomyl if spraying is needed. Oak wilt is a fatal disease beginning with a slight crinkling and paling of the leaves. This is followed by leaf wilting and browning of leaf margins then working inward. The symptoms move down branches toward the center of the tree.