Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in humid climates, often on walls, baseboards, or under furniture. They construct silken cases covered in debris to hide in.

Diet & Feeding

The larvae feed on old spider webs to eat the silk, as well as woolen fibers, hair, dead insects, and other organic debris found in dust.

Behavior Patterns

The larva drags its protective case around as it moves, retreating inside when threatened. It has openings at both ends of the case to easily switch directions.

Risks & Benefits

Generally harmless to humans (they do not bite or sting). However, they can be a minor pest as they feed on natural fibers like wool or silk clothing, though they primarily scavenge dust and spiderwebs.

Identified on: 3/7/2026