Buddleia leaf infested with foliar nematode. Photo provided by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware

Peony leaf blotch. Photo provided by:

Jody Fetzer, New York Botanical Garden, Bugwood.org

Alfalfa mosaic virus. Photo provided by:

Howard F. Schwartz, Colorado State University, Bugwood.org

Fire blight. Photo provided by: William Jacobi, Colorado State University, Bugwood.org