Symptoms progress upward to include more leaves and toward the ends of branches . Xylella fastidiosa Infected trees may survive for years. Severely affected trees should be removed. Dark streaks of sap, usually foul smelling, ooze from holes or cracks in the bark. The heartwood is discolored dark brown.
Pin oaks are especially prone to wetwood.
Various bacteria are involved. Avoid wounding the bark of affected trees. Care for the tree as normal, minimizing any stresses. Ganoderma Rot A butt rot may take several years to kill the tree but makes the tree very susceptible to windthrow. A very distinctive shelf-like fruiting structure forms singly on the wood at or near the soil line.