Bagworm n. : One of several lepidopterous insects which construct, in the larval state, a baglike case which they carry about for protection. One species (Platoeceticus Gloveri) feeds on the orange tree. See Basket worm.

Example:
Anything to do to control Bagworm during winter?

Taxonomy
bagworm, larva, silk, Mature larvae, Grass bagworm, adult, emergence, Thyridopteryx ephemeraeformis, band, eggs, pesticide, Ohio State University Extension, arborvitae, populations, defoliation, pupate, the bags, HYG.

Defination from the web:
bagworm, Thyridopteryx ephemeraeformis (Haworth), is an interesting caterpillar ... The bagworm occurs in the eastern United States from New England to Nebraska and south through Texas. ...