The Bagworm is a caterpillar that constructs bags formed by mostly leaf or needle tissue. These bags are carried with the caterpillars to surround them for protection during the growing season and to protect the eggs laid by the female throughout the winter months. Bagworm egg hatch usually occurs in early summer and the caterpillars either feed on the host plant or use fine webbing they make to float to other hosts (called ballooning). Bagworms are initially very small and can be hard see with an untrained eye. Once full grown the bags surrounding the caterpillar can be up to 2” in length.
Bagworms are insatiable eaters and can defoliate a tree or shrub quickly if high populations are present. Commonly affected trees include, spruce, arborvitae, eastern redcedar and even crabapple and birch trees. Control of bagworms can be easy if caught in the earlier stages of infestation. Spraying with insecticide or even soil injections are available for control.
If you suspect you have bagworms or would like more information on how to control bagworms, call one of our certified Arborists today.