Fall Webworm Caterpillar
Fifth instar caterpillar with a black head, yellowish sides, and a dark dorsal stripe. Its body was covered with long, white setae arising from tubercles located along the sides.
This species occurs throughout North America, although there are distinct physical differences between the northern and southern populations. Furthermore, the number of generations per year depends on latitude. The southern populations are multivoltine and may complete four generations per year, while northern populations are univoltine, completing only one life cycle per year.
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.