<unk>  is a fungal disease caused by the organism Bretziella fagacearum that threatens Quercus spp. The disease is limited to the Midwestern and Eastern United States; first described in the 1940's in the Upper Mississippi River Valley. The pathogen penetrates xylem tissue, preventing water transport and causing disease symptoms. Symptoms generally consist of leaf discoloration,<unk> , defoliation, and death. The disease is dispersed by insect vectors and to adjacent trees through underground root networks. However, human spread is the most consequential dispersal method. Moving firewood long distances can potentially transport diseases and invasive species.
Oak wilt
Cradle cap
Owl's eye appearance
Triangular face
Pink ribbon
Cramp-ring
Trimegestone
Digitate wart