Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in humid climates; common on walls, underneath furniture, in closets, and along baseboards. They prefer warm, protected environments.

Diet & Feeding

Detritivorous; larvae feed on old spider webs, wool, hair, lint, dead insects, and general household dust and debris.

Behavior Patterns

The larva constructs a flattened, pumpkin-seed-shaped case made of silk and debris which it carries around for protection. It extends its head to drag the case along walls and floors. It retreats fully inside when threatened.

Risks & Benefits

Generally harmless to humans (does not bite or sting). Can be a minor pest if they damage wool or natural fibers, but primarily nuisance pests due to the unsightly cases left on walls.

Identified on: 2/12/2026