Plaster Bagworm (or Household Casebearer)

Natural Habitat

Typically found indoors in humid climates, often seen on walls, in garages, or under eaves. They construct a case that they carry with them.

Diet & Feeding

Larvae feed on spider webs, old silk, wool, and other natural fibers, as well as shed insect skins and hair.

Behavior Patterns

The larva constructs a flat, pumpkin-seed-shaped case out of silk and debris (sand, soil, fibers) which it drags around. The larva can extend its head and legs from either end of the case to move or feed.

Risks & Benefits

Generally considered a harmless household nuisance. They do not bite or sting humans. While they can feed on wool or natural fibers, they rarely cause significant damage to clothing unless the infestation is severe. They provide a minor benefit by cleaning up spider webs and debris.

Identified on: 2/12/2026