Household Casebearer (often confused with Plaster Bagworm)

Natural Habitat

Typically found indoors, especially in humid climates like Florida or tropical regions. They frequent walls, baseboards, underneath furniture, and inside closets or garages where dust accumulates.

Diet & Feeding

Detritivores. They feed on old spider webs, wool, hair, lint, dead insects, and general household dust.

Behavior Patterns

The larva builds a protective, flattened, pumpkin-seed-shaped case out of silk and debris (sand, dust, lint) which it drags around. It has openings at both ends, allowing the larva to turn around inside and feed from either side. They eventually pupate inside this case.

Risks & Benefits

Risks: Generally considered a minor nuisance pest rather than a threat. They do not bite or sting. However, in large numbers, they can damage biological fabrics like wool or silk. Benefits: They indicate areas that need cleaning and help decompose biological debris.

Identified on: 2/20/2026