In spring, the Insects move to trees and feed on male flowers and year-old cones. Beginning in late May, females lay eggs glued in small groups to needles and leaves. The immature or nymph stages somewhat resemble wingless adults. Nymphs feed on the seeds through the summer. They become mature in August and September.
Adults continue to feed on cones until they move to winter shelter.
There is only one generation per year. There is probably little that will effectively control the occasional nuisance movement of conifer seed bugs into homes. The best action is to ensure that homes are well sealed during September and October, when most Insects migrate from trees to buildings and other winter shelter. It is probable that insecticide applications to building exteriors, particularly directed at cracks and openings where the Insects may enter, should assist in reducing numbers found indoors. However, insecticides have not been tested against these Insects.