Household Casebearer (often confused with Plaster Bagworm)
Scientific Name: Phereoeca uterella (or sometimes Phereoeca allutella)
Order & Family: Order: Lepidoptera, Family: Tineidae
Size: Larval case is typically 8-13 mm (approx. 0.3-0.5 inches) in length.
Natural Habitat
Typically found indoors in humid climates, often seen on walls, in corners, closets, and underneath furniture where dust and spiderwebs accumulate. They are common in Florida and tropical regions.
Diet & Feeding
The larvae feed on old spider webs, wool, hair, lint, dead insect parts, and sometimes natural fibers like wool or silk.
Behavior Patterns
The larva constructs a flattened, pumpkin-seed-shaped protective case out of silk and debris (like sand, soil, and insect parts) which it carries around. It can turn around inside the case to feed from either end. Before pupating, it attaches the case to a vertical surface.
Risks & Benefits
Generally considered a nuisance pest rather than a danger. They do not bite or sting humans. However, occasionally they may damage woolen clothing or fabrics if the infestation is significant. They are beneficial in that they clean up old spider webs and dead insects.
Identified on: 2/10/2026