Males emerge in September and mate with females through the bag entrance. Cultural Control 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. Chemical Control Chemical controls are effective if applied during early stages of bagworm development. Do not apply malathion to Canaerti juniper.
Wettable powders are less likely to cause injury than liquid formulations.
Always read, understand, and follow label directions. Store pesticides in original labeled containers out of reach of children. Minimize hazards by rinsing empty metal, glass, and plastic containers with water. Then place rinsed containers in the garbage or bury. Kenneth R. Bolen, Director of Cooperative Extension, University of Nebraska, Institute of Agriculture and Natural Resources.