Some mature females may also overwinter. In addition to the black markings, one or more cream-colored stripes occur down the center of their dorsal surface. Eggs hatch under the covering of the mother and crawlers begin to emerge by early June. A single female can lay hundreds of eggs that hatch over a period of several weeks. Striped-pine scale nymphs are generally orange to brown.
Female scales remain on the twigs while males migrate to the needles.
Males become enclosed in a papery covering as they mature. They emerge to mate with the females in late summer. There is one generation per year. Larvae of green lacewings and brown lacewings feed on crawlers and small females. However, no highly effective natural enemies of striped-pine scale have been identified in Colorado.