Plaster Bagworm (or Household Casebearer)

Natural Habitat

Typically found indoors in humid climates, often on walls, baseboards, and in corners of rooms like closets or garages. They are also found outdoors in sheltered areas.

Diet & Feeding

The larva feeds on silk (often spider webs), wool, lint, hair, dead skin cells, and dried insect parts.

Behavior Patterns

The larva constructs a distinctive flattened, pumpkin-seed-shaped case made of silk and debris (sand, soil, fibers), inside which it lives. It drags this case around as it moves. Before pupating, they often attach their case to a vertical surface.

Risks & Benefits

Generally considered a nuisance pest rather than a major threat. They do not bite or sting humans. However, they can cause minor damage to woolen fabrics, rugs, or furs if present in large numbers.

Identified on: 2/8/2026