oak wilt
Quick Summary
Oak wilt is a destructive plant disease affecting oak trees, caused by the fungus Ceratocystis fagacearum. It is characterized by wilting, discoloration, and defoliation.12
Symptoms vary between oak groups. Red oaks typically die within weeks during late spring and summer, with leaves turning pale or bronzed from the margins inward, affecting upper branches first. White oaks may die slowly over several years, with leaves wilting, turning brown, and clinging to stems.2
The disease spreads through underground root grafts, sap- and fungus-feeding insects, and possibly squirrels. Control measures include removing diseased trees, avoiding pruning during certain times of the year, and promptly painting wounds.2
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