Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in humid conditions, often on walls, under spiderwebs, in closets, or garages. They thrive in climates similar to Florida and Southeast Asia.

Diet & Feeding

Detritivores that feed on spiderwebs, old silk, wool, human hair, pet fur, and dead insect parts. They rarely eat cotton.

Behavior Patterns

The larva constructs a protective case out of silk and debris (sand, soil, insect parts) which it carries around. It drags this case as it moves, retreating inside when disturbed. It is often seen climbing walls.

Risks & Benefits

Generally considered a harmless household nuisance rather than a serious pest. They do not bite or sting humans. While they can eat wool, their primary diet of spiderwebs and dust means they rarely cause significant damage to clothing unless in large infestations.

Identified on: 2/8/2026