Extension > Garden > Diagnose a problem > What insect is this? > General/curiosity insects > Caterpillars, maggots, grubs, and similar immature insects greater than 2 inches long > Cecropia caterpillar
Jeff Hahn, Department of Entomology, University of Minnesota
Eugene E. Nelson, Colorado State University, Bugwood.org
Size: 3 1/2 - 4 inches long
Description: Light green with a double row of reddish orange knobs (turbercles) on the thorax behind the head. There are also series of smaller yellow and blue knobs (tubercles) on the abdomen.
Where/When: Can be found on various hardwood trees, including cherry, linden, maple, boxelder, elm, oak, birch, willow, hawthorn, and poplar in late summer and early fall.
Significance: Feeding essentially is never severe enough to injure trees; turns into attractive cecropia moth.