Household Casebearer (also known as the Plaster Bagworm)

Natural Habitat

Typically found indoors in humid climates, often seen on walls, baseboards, underneath furniture, or in closets. They create a protective case out of silk and debris (sand, soil, lint).

Diet & Feeding

Feeds on keratin-containing materials such as spider webs, wool, hair, and sometimes dried insects. They are detritivores.

Behavior Patterns

The larva lives inside a flattened, pumpkin-seed-shaped case which it drags around while feeding. It can emerge from either end of the case. They eventually pupate inside this case before emerging as small moths.

Risks & Benefits

Generally harmless to humans (they do not bite or sting). They are considered a minor household pest because they can feed on woolen fabrics or rugs, but they primarily feed on spider webs and old insect debris.

Identified on: 2/16/2026