White, cottony masses or brownish, crusty bumps cover the needles and stems. The bumps can be scraped or picked off. Needles turn yellow, and new growth slows. In severe cases, branches die back. A shiny, sticky substance may coat the leaves. A black sooty mold often grows on it.
Control with an insecticide labeled for scales, or an insecticidal soap. During the winter, treat with a horticultural oil.