Steven Katovich, Bugwood.org
Large oak tree killed by oak wilt.
Joseph OBrien, USDA Forest Service, Bugwood.org
Oak wilt symptoms.
Paul A. Mistretta, USDA Forest Service, Bugwood.org
Foliar symptoms on Texas red oak caused by oak wilt.
Ronald F. Billings, Texas A&M Forest Service, Bugwood.org
Early symptoms on foliage.
C.E. Seliskar, Bugwood.org
Foliar symptoms on black oak showing bronzing at the leaf apices and lobes.
Minnesota Department of Natural Resources - FIA , Minnesota Department of Natural Resources, Bugwood.org
Oak wilt leaf symptoms.
Individual leaf symptoms.
Fred Baker, Utah State University, Bugwood.org
Foliar symptoms on bur oak.
Interveinal chlorosis Texas live oak.
Interveinal chlorosis leaf symptoms on Texas live oak.
USDA Forest Service , Bugwood.org
Close-up view of fungal mat on peeled stem. Sign of oak wilt.
Sandra Jensen, Cornell University, Bugwood.org
Streaking in the vascular system beneath the bark, may be a sign of oak wilt.