Household Casebearer (often specifically the Plaster Bagworm or Clothes Month larva case)

Natural Habitat

Typically found indoors in humid climates, often on walls, in closets, garages, and underneath furniture where spider webs accumulate.

Diet & Feeding

The larvae feed on keratin found in natural fibers (wool, silk), spider webs, hair, lint, dead insects, and occasionally dried food products.

Behavior Patterns

Larvae construct a flattened, pumpkin-seed-shaped protective case out of silk and environmental debris (sand, dust, paint chips, insect parts). They drug this case around with them as they maximize protection. They are most active at night or in dark areas.

Risks & Benefits

Generally harmless to humans (they do not bite or sting), but they can be a nuisance pest. They may cause minor damage to wool, silk, or fur clothing and rugs, though they primarily feed on spider webs and old insect debris.

Identified on: 2/20/2026