Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in humid climates, often on walls, baseboards, or under spiderwebs in corners. They thrive in garages, closets, and bathrooms.

Diet & Feeding

Feeds on old spider webs, wool, hair, lint, dead insects, and dried animal remains. They are detritivores.

Behavior Patterns

The larva constructs a protective, flattened, pumpkin-seed-shaped case made of silk and debris (sand, dust, frass) in which it lives and carries around. It has openings at both ends allowing the larva to turn around inside and feed from either end.

Risks & Benefits

Generally considered a nuisance pest rather than dangerous. They do not bite or sting humans. However, in large numbers, they can damage fabrics, woolens, or rugs.

Identified on: 3/9/2026