Household Casebearer or Plaster Bagworm

Natural Habitat

Typically found indoors on walls, in corners, underneath furniture, and inside closets. They thrive in humid environments like garages and bathrooms, especially in tropical or subtropical climates.

Diet & Feeding

They feed on old spider webs, fibers (wool, silk), dead insects, and shed human or pet hair. They are scavengers rather than hunters.

Behavior Patterns

The most unique behavior is the construction of a flattened, pumpkin-seed-shaped protective case made of silk and debris (sand, dust, lint). The larva lives inside this case and drags it around as it feeds. They eventually pupate inside this case.

Risks & Benefits

Risks: Generally considered a minor household pest. They do not bite or sting humans, but they can damage natural fiber clothing (like wool) and rugs if infestations are heavy. Benefits: They act as cleaners by eating cobwebs and dead insects, though most homeowners prefer not to have them.

Identified on: 2/18/2026