In severe infestations may kill plant. Identification Scale cover resembles small oyster shell. The adults are usually clustered together and in severe infestations may cover the bark of infested branches completely. Life History Eggs laid in late fall, 40-150 per female.
Hatching occurs in late spring.
The scales are white in color at first but become brown with maturity. They mature about the middle of July, mate, and lay eggs. This second generation develops and by late fall they lay the eggs which overwinter for the spring generation. Control Sprays should be applied at time of crawler hatch and emergence from the old females, in mid-late May and again in late July or early August. Remarks Populations tend to congregate on one or a few branches or on entire tree, seldom a few scales scattered over the host.