Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors on walls, baseboards, closets, and in corners of rooms. In nature, they live in sheltered areas like spider webs or rock crevices.

Diet & Feeding

Feeds on natural fibers, spider silk, hair, lint, dead insects, woolen materials, and old skins shed by insects.

Behavior Patterns

The larva builds a flattened, pumpkin-seed-shaped case out of silk and debris (sand, dust, fibers) for protection. It drags this case around as it moves and can retreat inside when threatened. It eventually pupates inside the case.

Risks & Benefits

Generally harmless to humans (does not bite or sting). Considered a minor household pest because they can damage fabrics like wool or chew on rugs, though they primarily feed on existing detritus and dust.

Identified on: 2/27/2026