Oak wilt – Ceratocystis fagacearum (Bretz) Hunt

foliar symptoms on northern red oak - F.A. Baker, Utah State University

Oak wilt is caused by the fungus Ceratocystis fagacearum which develops in the outer sapwood of the tree. The infected tree reacts by developing tyloses and gums which subsequently restrict the flow of water and nutrients in affected vascular tissues with the result that the tree wilts and subsequently dies.

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