Plaster Bagworm (or Household Casebearer)

Natural Habitat

Typically found indoors in humid climates; common on walls, baseboards, and in closets, especially in corners or under furniture.

Diet & Feeding

Detritivores; they feed on spider webs, wool, hair, lint, dead insects, and general household dust/debris.

Behavior Patterns

The larva constructs a flat, spindle-shaped or pumpkin-seed-shaped protective case out of silk and debris, dragging it along as it moves. The larva can extend its head from either end of the case to feed or move.

Risks & Benefits

Risks: Generally considered a nuisance pest rather than a danger; can damage woolens or fibers in large numbers. Benefits: They clean up minor debris and old spider webs.

Identified on: 3/5/2026