Pine needle rust. Photo provided by: Bob Mulrooney, Plant Pathology Extension Specialist, University of Delaware

Anthracnose on ash. Photo provided by: Joseph O’Brien, USDA Forest Service, Bugwood.org

Close-up of anthracnose on ash tree leaves. Photo provided by: Joseph O’Brien, USDA Forest Service, Bugwood.org

Anthracnose on ash leaves. Photo provided by: Virginia Tech Learning Resources Center, Virginia Polytechnic Institute and State University, Bugwood.org

Phyllosticta leaf spot on a maple tree. Photo provided by: Joseph O’Brien, USDA Forest Service, Bugwood.org