Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

Extension > Garden > Diagnose a problem > What insect is this? > Trees and shrubs > Caterpillars, maggots, grubs, and similar immature insects - 1 to 2 inches long > Spiny elm caterpillar

Print Icon Email Icon Share Icon

Spiny elm caterpillar

Nymphalis antiopa

Spiny elm caterpillar

Jeff Hahn, University of Minnesota Extension

Description: 2 inches long. Dark colored body, peppered with white spots, eight red spots running along top of body and armed with black thorn-like spines.

Where/When: Prefers elm and willow; also, attacks hackberry, poplar, aspen and birch. Present May to June and again in July to August.

More information on Spiny elm caterpillar

Did this tool help you identify the insect? Tell us.