Extension > Garden > Diagnose a problem > What insect is this? > General/curiosity insects > Caterpillars, maggots, grubs, and similar immature insects greater than 2 inches long > Polyphemus caterpillar
Jeff Hahn, Department of Entomology, University of Minnesota
Steven Katovich, USDA Forest Service, Bugwood.org
Size: 3 - 3 1/2 inches long
Description: Pale green with sparse long hairs along the top and sides of the abdomen.
Where/When: Can be found on many different deciduous trees and shrubs, including ash, birch, maple, oak, and willow. It has also been known to eat grape leaves. Commonly seen during August and September.
Significance: Feeding essentially is never severe enough to injure trees; turns into attractive Polyphemus moth.