Household Casebearer (often confused with Plaster Bagworm)

Natural Habitat

Typically found indoors in humid climates, often seen on walls, in corners near ceilings, underneath furniture, or in closets. They create cases out of silk and debris which they carry with them.

Diet & Feeding

Larvae feed on old spider webs, wool, hair, lint, dead insects, and other organic debris found in households.

Behavior Patterns

The larva constructs a flattened, pumpkin-seed-shaped case open at both ends, allowing it to turn around inside and feed from either end. They drag this protective case with them as they move. They eventually pupate inside the case before emerging as a small moth.

Risks & Benefits

Generally considered a nuisance pest rather than a major threat. They do not bite or sting humans. While they can feed on wool fibers (clothes moths), they primarily eat spider webs and debris, making them relatively harmless compared to other fabric pests. Regular cleaning usually keeps populations in check.

Identified on: 3/4/2026