Michelle Grabowski, UMN Extension Educator
Several shrubs and shade trees exhibiting symptoms of verticillium wilt have been recently observed in Minnesota. Verticillium wilt is caused by the fungus Verticillium dahliae. This pathogen infects through roots and moves into the vascular system of the plant. Infected trees and shrubs may have small pale leaves or leaves with scorched edges in chronic infections. In severe infections, leaves may be completely discolored yellow to red, curl, wilt and die. Often symptoms of verticillium wilt appear on one to a few branches in the canopy. If you suspect Verticillium wilt may be a problem in a shade tree or shrub, peel back the bark on an infected branch and look for grayish streaking in the sapwood. To learn more about Verticillium Wilt visit the UMN Extension web publication Verticillium Wilt of Trees and Shrubs.