Hemlock woolly adelgid egg masses. Photo provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Roseslug sawfly damage to a rose leaf. Photo provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Roseslug sawfly larva feeding on rose leaf. Photo provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Cedar apple rust. Photo provided by: Daniel H. Brown, USDA Forest Service, Bugwood.org

Cedar apple rust. Photo provided by: USDA Forest Service – Region 8 Archive, USDA Forest Service, Bugwood.org