Household Casebearer (often referred to as Plaster Bagworm)

Natural Habitat

Commonly found indoors on walls, in corners, and under furniture, especially in humid climates like Florida or tropical regions. They build protective cases out of silk and debris.

Diet & Feeding

Larvae feed on spider webs (often old ones), woolen fibers, hair, dead insects, and general household detritus or dust.

Behavior Patterns

The larva drags its flattened, pumpkin-seed-shaped case around with it as it moves. It can retreat inside the case at both ends if threatened. Before pupating, it attaches the case to a vertical surface like a wall.

Risks & Benefits

Generally considered a minor pest rather than a major threat. They are not harmful to humans (they don't bite or sting) but can be a nuisance. They may cause minor damage to woolen fabrics but primarily feed on spider webs and old dust.

Identified on: 3/3/2026