Plaster Bagworm / Household Casebearer

Natural Habitat

Typically found indoors in humid climates, often seen on walls, ceilings, baseboards, underneath furniture, or in closets. They create a protective case from fibers, soil, and debris.

Diet & Feeding

The larvae feed on spider webs, old silk, wool, human hair, pet fur, and dead insect parts. They generally act as scavengers.

Behavior Patterns

The larva constructs a flat, pumpkin-seed-shaped case silken case that it drags around with it. It has openings at both ends so the larva can turn around inside and emerge from either end to feed or move. When ready to pupate, it attaches the case to a surface.

Risks & Benefits

They do not bite or sting humans. While harmless to people, they can be a minor pest if they appear in large numbers, simply because they are unsightly. In very high infestations, they might cause minor damage to woolen fabrics, though this is less common than with clothes moths.

Identified on: 2/15/2026