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. Prune heavily infested branches to the soil surface. A dormant spray in early spring before the buds have started to open will decrease the scale population but also may defoliate the plant. New leaves will rapidly replace those lost. Reapply as needed in late August to early September to control second generation crawlers.