Household Casebearer (often referred to as Plaster Bagworm or Case-bearing Clothes Moth)

Natural Habitat

Typically found indoors in warm, humid climates. They attach themselves to walls (specifically plaster or stucco), baseboards, closets, underneath furniture, and in areas where spiderwebs or dust collect.

Diet & Feeding

The larvae feed on keratin (found in wool, hair, fur, and feathers), silk, and detritus such as dead insects, spider webs, and lint.

Behavior Patterns

The larva constructs a distinctive flat, pumpkin-seed or diamond-shaped protective case out of silk and debris (sand, soil, fibers). It drags this case around as it moves and can turn around inside the case to feed from either end. When ready to pupate, it attaches the case to a vertical surface.

Risks & Benefits

Risks: Detailed as a minor household pest because they can damage natural fibers like wool carpets, rugs, or clothing, though they generally prefer spider webs and dust. They do not bite or sting humans. Benefits: Functionally, they act as cleaners by eating webs and dead insects, but their presence is generally unwanted indoors.

Identified on: 3/7/2026