Spring cankerworm on a leaf. Photo provided by: James B. Hanson, USDA Forest Service, Bugwood.org

Spring cankerworm adult. Photo provided by: Jerald E. Dewey, USDA Forest Service, Bugwood.org

Fall cankerworm damage. Photo provided by: USDA Forest Service – Ogden Archive, USDA Forest Service, Bugwood.org

Fall cankerworm feeding on a leaf. Photo provided by: Tim Tigner, Virginia Department of Forestry, Bugwood.org

Fall cankerworm larva. Photo provided by: John H. Ghent, USDA Forest Service, Bugwood.org

Fall cankerworm female laying eggs. Photo provided by: John H. Ghent, USDA Forest Service, Bugwood.org

Elm spanworm damage. Photo provided by: USDA Forest Service – Region 8 Archive, USDA Forest Service, Bugwood.org

Elm spanworm camouflaged to look like a stick. Photo provided by: North Carolina Forest Service Archive, Bugwood.org

Elm spanworm on a leaf. Photo provided by: Arnold T. Drooz, USDA Forest Service, Bugwood.org