Household Casebearer (often confused with Plaster Bagworm)
Scientific Name: Phereoeca uterella (or sometimes Phereoeca allutella)
Order & Family: Lepidoptera, Tineidae
Size: Larval case is typically 8-13 mm (approx. 0.3-0.5 inches) in length.
Natural Habitat
Typically found indoors in warm, humid climates; they often frequent closets, bathrooms, and garages, sticking to walls, baseboards, and underneath furniture.
Diet & Feeding
Detritivores that feed on old spider webs, wool, hair, lint, dead insects, and other organic debris found in dust bunnies.
Behavior Patterns
The larva constructs a flattened, pumpkin-seed-shaped protective case out of silk and debris (sand, dust, fibers) which it drags along as it moves. It can feed from either end of the case. They are solitary and slow-moving.
Risks & Benefits
Generally considered a nuisance pest rather than a danger. They do not bite or sting humans. However, in large numbers, they may damage wool clothing or fabrics, similar to clothes moths.
Identified on: 2/8/2026