bagworms love Eastern red cedar. Each bag contains 300 + eggs and the key to control early. The mature bags this time of year, are last summers, the femle died in the fall and contains the eggs for the new generation. Male bagworms emerged in the fall and mated with the females through an opening in the bag, Control is accomplished by removing old bags and spraying now. The eggs are hatching now or very soon, Chemical control works well with small bagworms.