Females deposit up to 1,000 eggs in or on the pupal case, drop to the ground and die. The eggs overwinter. There is only one generation per year. When infestations are light, hand destruction of bags during late fall and early winter will reduce or eliminate populations by destroying the overwintering eggs. Insecticide applications are effective but should be made when the bags and larvae are small.
Older larvae are harder to control.
Thoroughly wet the bags with insecticide sprays. Controls are best applied late in the day when bagworms are more active. The pine colaspis, Colaspis pini Barber, is an occasional pest of Christmas trees. It is known to feed on most species of Southern pines but rarely causes significant economic injury. They are about 5 mm long.