Household Casebearer (often confused with Plaster Bagworm)

Natural Habitat

Typically found indoors in humid climates, often on stucco walls, under furniture, in corners, or in garages. They thrive in warm, high-humidity environments.

Diet & Feeding

Detritivores feeding on old spider webs, wool, hair, dead insects, shed insect skins, lint, and other keratin-based or organic fibers.

Behavior Patterns

The larva builds a flattened, pumpkin-seed-shaped protective case out of silk and debris (sand, soil, frass) bounded together. The larva stays inside this case, dragging it along as it moves. It has openings at both ends of the case, allowing it to turn around inside and feed from either end. When ready to pupate, it attaches the case to a vertical surface.

Risks & Benefits

Generally harmless to humans (they do not bite or sting). While they are pests that consume organic fibers, they rarely cause significant damage to clothing unless in large infestations, unlike true clothes moths. Their presence often indicates high humidity or dusty conditions.

Identified on: 3/3/2026