Plaster Bagworm

Natural Habitat

Commonly found inside residential homes, garages, and under buildings in warm, humid climates.

Diet & Feeding

Larvae feed on spider webs, wool fibers, hair, and biological debris. They are well-known for eating the webbing produced by spiders.

Behavior Patterns

The larva lives inside a spindle-shaped silk case covered in sand, dust, and lint. It can poke its head out from either end of the case to move or feed. The life cycle involves a transformation from larva to pupa inside this protected bag before emerging as a small moth.

Risks & Benefits

They are considered a minor household pest. While they do not bite humans, they can damage silk or wool fabrics. They provide a minor benefit by cleaning up old spider webs and dust debris.

Identified on: 2/3/2026