Bagworms overwinter in the egg stage inside female bags fastened to twigs. Eggs hatch in late May and early June, and larvae feed until August or early September. As larvae grow, leaf fragments are added to the bag, which may reach a length of 2 inches by the end of summer. Control infestations on small trees and shrubs by removing bags during the winter and spring before the eggs begin to hatch in late May. Destroy bags by burning, immersing in kerosene or by crushing. If bags containing larvae are discarded on the ground, the larvae can return to host plants.
Insecticides are effective if applied during the early stages of bagworm development.
For most effective control and prevention of early season damage, apply from early to mid June. All of these products are excellent control sprays for bagworms. Ortho Orthene Also effective for controlling middle stage bagworms. Available in pint concentrate. Nursery L.C. All rights reserved.