Bagworm season will be here in a matter of days. Bagworms have been known to feed on about 128 plant species, according to the University of Missouri's Department of Entomology. Most commonly, they attack arborvitae, red cedar and various other juniper species, as well as black locusts, maples, and sycamores.
As we are entering bagworm season, it's important for you to know how what bagworms are and how to spot them. The University of Missouri reports that the most obvious sign of an infestation is "the presence of silken bags attached to a branch. The bag somewhat resembles a Christmas tree ornament hanging from a limb." Bagworm larvae will begin to emerge from these bags from May to mid-June, and almost instantaneously, the larvae will begin to produce a protective bag or covering around its body. As the larva matures, it will spend its time feeding on the foliage of the tree and may incorporate pieces of twigs and leaves in its bag to add strength and camouflage itself for protection. Larvae spend their entire lives in their bags and pass through four molts.
Full-grown bagworm larvae are typically about one-inch in length. The upper regions of their bodies are yellowish in color with black spots, and the rest of their bodies are dark brown. Usually, mature larvae stop feeding in mid-August. At that time, they attach to a twig and by mid-September complete their development, and then mate. Adult males emerge from their bags and are moth-like in appearance, with a furry black body and feather-like antenna, according to the University of Missouri. Adult females are a little less than an inch in length and never leave their bags. They are maggot-like in appearance. Both male and female bagworms die after mating.
We plan to bring you more information about how to treat bagworms in the near future, so be sure to check back with us often! Of course, if you have any questions about bagworms or any other tree healthcare issues, contact Cartwright Tree Care! We would be happy to assist you!
Image Courtesy of the University of Missouri Extension.