Affected foliage appears to have small white cottony spots. Leaves eventually turn yellow and die as feeding continues.
Large numbers congregate on the undersides of leaves, twigs, and stems.
About 60 days are required to complete a generation. There may be two generations per year. In the spring, overwintering females lay eggs that hatch in late May or early June. Crawlers move to leaves and stem and begin to feed by sucking plant juices. Maturing males prefer leaves and females congregate on stems.