Household Casebearer (Plaster Bagworm)

Natural Habitat

Typically found indoors in humid climates, often on stucco walls, under furniture, or in corners of garages and closets. They construct a protective case from silk and debris.

Diet & Feeding

Detritivores feeding on old spider webs, wool, hair, lint, dead insects, and dried animal skins.

Behavior Patterns

The larva never leaves its protective case, dragging it along as it moves. The case is flat and pumpkin-seed shaped, open at both ends so the larva can turn around inside to feed from either end. They eventually pupate inside this case.

Risks & Benefits

Generally considered a nuisance pest rather than a threat. They do not bite or sting. While they can damage wool or natural fibers, they are usually found in low numbers and feed mostly on general house dust and cobwebs.

Identified on: 2/26/2026