Household Casebearer (Plaster Bagworm)
Scientific Name: Phereoeca uterella
Order & Family: Order Lepidoptera, Family Tineidae
Size: Case is typically 8 mm to 14 mm in length.
Natural Habitat
Found inside buildings, particularly on walls in humid, tropical, and subtropical climates.
Diet & Feeding
The larvae feed on spider webs, wool, and human hair, as well as natural fibers like silk.
Behavior Patterns
The larva constructs a protective silk case covered with debris and carries it while crawling. The case is spindle-shaped and open at both ends so the larva can exit from either side to feed.
Risks & Benefits
They are considered a minor household pest because they can damage silks and wool garments. They do not pose a direct health risk to humans or pets.
Identified on: 4/4/2026