Plaster Bagworm (larval stage)

Natural Habitat

Commonly found indoors on walls (especially stucco or plaster) and ceilings in humid climates; also found in garages and underneath furniture.

Diet & Feeding

Detritivores; they feed on spider webs, old silk, wool, human hair, pet fur, dead insects, and other organic debris found in house dust.

Behavior Patterns

The larva constructs a flat, spindle-shaped case (similar to a pumpkin seed) made of silk, sand, and debris, which it carries around for protection. It moves by dragging this case along surfaces. When threatened, it retreats inside both ends.

Risks & Benefits

Generally harmless to humans and pets (they do not bite or sting). They are considered a minor household pest because they can damage natural fibers like wool and silk, and their presence is often considered unsightly.

Identified on: 2/14/2026