Household Casebearer (Plaster Bagworm)

Natural Habitat

Typically found indoors in humid climates, often on walls, baseboards, and in corners of garages or bathrooms. They thrive in subtropical and tropical regions.

Diet & Feeding

Larvae feed on spider webs, old insect skins, wool, human hair, and other keratin-rich organic debris found in dust.

Behavior Patterns

The larva constructs a protective, flattened, pumpkin-seed-shaped case out of silk and camouflage debris (like sand, soil, or paint flakes). It drags this case around as it moves and can retreat inside if threatened.

Risks & Benefits

Generally harmless to humans and does not bite or sting. However, they can be a minor nuisance pest in homes and may cause slight damage to woolens or natural fibers if present in large numbers.

Identified on: 3/5/2026