Household Casebearer or Plaster Bagworm

Natural Habitat

Commonly found indoors on walls (especially stucco or plaster), in corners, under furniture, or inside garages and closets. They thrive in humid environments.

Diet & Feeding

The larva feeds on spider webs, old silk, wool, hair, dry insect remains, and other detritus found in homes.

Behavior Patterns

The larva constructs a protective case made of silk and debris (sand, dust, fibers) which it drags around with it. It can retreat inside the case at both ends. It pupates inside this case before emerging as a small moth.

Risks & Benefits

Generally harmless to humans (does not bite or sting). Considered a minor household pest because they can damage wool or natural fibers, though they mostly feed on debris and spider webs.

Identified on: 3/8/2026