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Bagworm

The bagworm is a perennial insect pest of arborvitae, juniper, pine, spruce, and many other evergreen species.  Their dispersal over wide areas occurs mainly through movement of infested nursery stock and ornamental plants, or by ballooning (wind dispersal) of small bagworm larvae during early June. This insect is most easily recognized by the case or bag that the caterpillar forms and suspends from ornamental plants on which it feeds. Damage by mature larvae is especially destructive to evergreen plants. Unfortunately, bagworm infestations generally go undetected until damage is complete, and the large bags constructed by this pest are very conspicuous. Early detection of an infestation requires careful examination of host plants for the presence of small bagworms attached to the leaves or needles. The bagworm may be managed on small shrubs and trees by handpicking or cutting the bags from infested plants during late fall, winter, or early spring, before egg hatch. When bagworms are too numerous to handpick, an insecticide application may be indicated. These products should be applied from early to mid-June while the larvae are small.