Caterpillars of Eastern Forests
Elm Spanworm (Ennomos subsignaria)
Green, brown, or black with yellow to red head, legs, and rump. Head rounded, without mottling. Abdomen with lateral wrinkling, abdominal segments with longitudinal crease below spiracle. Dorsum of abdominal segments with raised ridges (second and fifth) or warts (eighth). Food: oaks, birches, elms, and maples preferred, but caterpillars defoliate many hardwoods during outbreaks. Caterpillar: May to early July; 1 generation.
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