Dutch Elm disease. Photo by: William M. Brown Jr., Bugwood.org
Vascular staining by fungus. Photo by: Paul H. Peacher, USDA Forest Service, Bugwood.org.
Powdery mildew on roses. Photo by Bob Mulrooney, Plant Pathologist, University of Delaware.
Powdery Mildew on common lilac. Photo by: Whitney Cranshaw, Colorado State University, Bugwood.org.
Frog-eye leaf spot on red maple. Photo by Bob Mulrooney, Plant Pathologist, University of Delaware.
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