Household Casebearer (or Plaster Bagworm)
Scientific Name: Phereoeca uterella (sometimes referred to as Phereoeca allutella)
Order & Family: Order: Lepidoptera, Family: Tineidae (Clothes Moths)
Size: Larval case is usually 8-13 mm long
Natural Habitat
Typically found indoors on walls, ceilings, and in humid corners like garages or bathrooms; common in tropical and subtropical climates.
Diet & Feeding
Feeds on detritus such as spider webs, hair, dead insects, woolen fibers, and old plaster or paint flakes.
Behavior Patterns
The larva builds a flattened, pumpkin-seed-shaped protective case out of silk and debris (sand, dust, frass) which it carries around. It extends its head and legs to drag the case along surfaces.
Risks & Benefits
Generally harmless to humans (does not bite or sting). Can be a minor pest if they damage wool or natural fabrics, but largely considered a nuisance due to their appearance on walls.
Identified on: 2/25/2026