Male pupae wiggle part way out of the bag through the lower opening. Mating with the female inside the larval bag is accomplished through the opening at the lower end of the case. Oviposition generally occurs in September. The number of eggs per female varies, but most lay 400-1000 eggs. Following oviposition, the female drops from the bag and dies.
Eggs remain in the old bags through winter and hatch the following spring.
Only one generation occurs each year. Damage, Importance, and Control Bagworm larvae cause damage to host trees by consuming foliage. How severely the tree is injured depends on the amount of foliage lost and the type of tree evergreen vs. deciduous. In such situations, control may be desirable, even necessary. For recommendations for control of bagworm, contact county Extension personnel.