Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in humid climates, often on walls, baseboards, under furniture, or in corners of garages and closets. They thrive in high humidity.

Diet & Feeding

Feed on old spider webs (cobwebs), wool, hair, lint, dead insects, and other organic debris found in household dust.

Behavior Patterns

The larva constructs a protective, flattened, pumpkin-seed-shaped case out of silk and debris (sand, soil, droppings) which it carries around. It has openings at both ends, allowing the larva to feed and move from either side without turning around.

Risks & Benefits

Generally considered a harmless nuisance pest. They do not bite or sting humans. While they can feed on wool fibers, they are less destructive to clothing than common clothes moths. Their presence often indicates high humidity or accumulated dust.

Identified on: 2/14/2026