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Leaves wilt and branches die, their sapwood darkly discolored. Within a year the whole tree may be dead. This is oak wilt, so far uncheckable and incurable. Trees dying of it should be removed and burned promptly. This wilt is caused by a fungus called Ceratocystis fagacearum which enters through lesions, maybe also through the roots. It is earned by flies, beetles, and borers, and maybe is also air-borne. If you hear of oak wilt in your vicinity, repair your oaks' wounds promptly. Spraying with fungicides may help. Ceratocystis can also attack apple, birch, dogwood, sassafras. Sycamore and Planes. Singly or in clusters, leaves brown, |
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