Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in warm, humid climates, often on walls, in corners of rooms, or underneath furniture (especially near spider webs).

Diet & Feeding

Feeds on old spider webs, accumulation of dust, lint, woolen fibers, and insect debris.

Behavior Patterns

The larva constructs a distinctive flattened, pumpkin-seed-shaped case out of silk and debris (sand, soil, frass), which it carries around for protection. It drags this case along surfaces as it searches for food.

Risks & Benefits

Generally harmless to humans and pets; they do not sting or bite. However, they can be a minor nuisance pest in homes. They may occasionally damage woolens or fibers, similar to clothes moths, but usually feed on debris.

Identified on: 3/7/2026