Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in humid climates, often seen on walls (especially stucco or plaster), baseboards, in closets, or under furniture. They thrive in garages and underneath spiderwebs.

Diet & Feeding

Detritivores. The larvae feed on old spider webs, wool, hair, lint, dried insect remains, and other natural fibers found in household dust.

Behavior Patterns

The larva constructs a flattened, pumpkin-seed-shaped protective case made of silk and debris (sand, soil, paint fragments) which gives it camouflage. It drags this case around as it moves and can retreat inside when threatened. It eventually pupates inside this same case.

Risks & Benefits

Risks: Generally harmless to humans (does not bite or sting). Can be a minor pest if they damage wool clothing or rugs, though they primarily eat debris. Benefits: They help break down minor organic waste like old cobwebs and dead insects.

Identified on: 3/1/2026