Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in humid climates, often seen on walls, ceilings, baseboards, and in closets. They prefer areas with spiderwebs or accumulated dust.

Diet & Feeding

The larvae feed on silk (from spider webs), wool fibers, pet hair, lint, and sometimes dead insect parts.

Behavior Patterns

The larva constructs a flattened, pumpkin-seed-shaped protective case out of silk and dust/debris, which it drags around. It can emerge from either end of the case to feed or move. They ultimately pupate inside this case.

Risks & Benefits

Generally considered a minor household pest. They do not bite or sting humans. While they can feed on woolen fabrics (similar to clothes moths), they are often just a nuisance rather than causing major structural damage.

Identified on: 3/5/2026