Horsechestnut leaf blotch. 
Coleosporium rust (Aster rust) on golden rod.
Powdery mildew on Leucothoe. All photos by: Bob Mulrooney, Extension Plant Pathologist, University of Delaware.
Disease Hotline Issue 19
Ornamentals Hotline
Horsechestnut leaf blotch.
Coleosporium rust (Aster rust) on golden rod.
Powdery mildew on Leucothoe. All photos by: Bob Mulrooney, Extension Plant Pathologist, University of Delaware.