Vascular discoloration in red oak branch.
Crack in bark of red oak caused by mycelial mat of the oak wilt fungus.
Sap feeding beetles that vector oak wilt.
Endoconidia of Ceratocystis fagacearum.
Department of Plant Pathology | 495 Borlaug Hall 1991 Upper Buford Circle | St. Paul, MN 55108 (612) 625-8200 | Fax: (612) 625-9728 | email@example.com