Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors in warm, humid structures. They attach to walls, ceilings, baseboards, and under furniture.

Diet & Feeding

Detritivores that feed on spider webs, old silk, woolen fibers, human hair, lint, and dead insects.

Behavior Patterns

The larva constructs a distinctive flattened, pumpkin-seed-shaped case out of silk, sand, and debris which it carries around. It can retract fully into the shell when threatened. They eventually pupate inside this case.

Risks & Benefits

Risks: Generally harmless to humans but can be considered a household pest requiring removal if numbers are high. They may damage fabrics like wool or silk. Benefits: They consume household debris like cobwebs and old insect skins/parts.

Identified on: 3/6/2026