Plaster Bagworm (or Household Casebearer)

Natural Habitat

Typically found indoors in humid climates, often on walls, baseboards, or under furniture like spiderwebs. They are common in areas with high humidity such as Florida.

Diet & Feeding

Larvae feed on old spider webs, wool, hair, lint, and dead insects. They are detritivores.

Behavior Patterns

The larva constructs a distinctive flattened, pumpkin-seed-shaped protective case out of silk and debris (sand, soil, frass) which it carries around. It has openings at both ends to allow the larva to feed and move without leaving the case entirely.

Risks & Benefits

Generally harmless to humans (does not bite or sting). Considered a minor household pest because they can damage wool or natural fibers, though they mostly eat debris. Their presence often indicates a need for better cleaning or dusting.

Identified on: 3/11/2026