Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in dry, dusty areas of homes, particularly on walls, in corners, on wool fabrics, behind furniture, or in spider webs. They thrive in humid climates like Florida or tropical regions.

Diet & Feeding

Detritivores feeding on old spider webs, wool, hair, lint, dead insects, and dried animal skins or fur.

Behavior Patterns

The larva constructs a distinctive flattened, pumpkin-seed-shaped protective case made of silk and debris (sand, lint, soil) which it carries around. It has openings at both ends, allowing the larva to turn around inside and emerge from either end to feed or move. They are often seen dragging this case slowly up walls.

Risks & Benefits

Generally harmless to humans (they do not bite or sting). They are primarily a nuisance pest. While they can damage wool or natural fibers, they are rarely abundant enough to cause significant destruction like clothes moths. However, large infestations can be unsightly.

Identified on: 3/2/2026