Hyphantria cunea larva feeding on Common MIlkweed
Hyphantria cunea (Fall Webworm) larva feeding on Common MIlkweed (Asclepias syriaca) leaves. This larva and another one were on the milkweed plant for a few days eating the leaves. They are fully grown and had been part of a larger colony that lived on a Chokecherry (Prunus virginiana) shrub.

The fall webworm, "Hyphantria cunea", is a moth in the family Arctiidae known principally for its larval stage, which creates the characteristic webbed nests on the tree limbs of a wide variety of hardwoods in the late summer and fall. It is mainly an aesthetic pest, and is not believed to harm otherwise healthy trees. It is well known to commercial tree services and arboriculturists.