Household Casebearer (or Plaster Bagworm)

Natural Habitat

Commonly found indoors on walls, baseboards, and carpets, especially in humid climates like Florida and tropical regions. They prefer darker, undisturbed areas.

Diet & Feeding

The larvae feed on old spider webs, wool, hair, lint, dead insect parts, and sometimes plaster or fabric. They are detritivores.

Behavior Patterns

The larva constructs a silken protective casing that is often camouflaged with dust, sand, or paint chips. It carries this case with it as it moves and can retreat inside when threatened. They eventually pupate inside the case.

Risks & Benefits

Generally harmless to humans (they do not bite or sting). They can be a nuisance pest in homes and may cause minor damage to fabrics like wool, but are less destructive than webbing clothes moths. They help clean up minor organic debris like spider webs.

Identified on: 3/5/2026