Household Casebearer Moth Larva (Plaster Bagworm)

Natural Habitat

Typically found indoors in humid climates, often in corners, under furniture, or on walls and wool carpets. They build protective cases often resembling debris.

Diet & Feeding

They feed on protein-rich fibers such as wool, silk, and spider webs, as well as general house dust and dead insect parts (detritus).

Behavior Patterns

The larva constructs a flat, spindle-shaped case (similar to a pumpkin seed) out of silk and debris (sand, dust, fibers) which it drags around while feeding. It eventually pupates inside this case.

Risks & Benefits

Generally harmless to humans (no biting or stinging), but can be considered a minor pest as they can damage clothing, carpets, and upholstery made of natural fibers.

Identified on: 3/2/2026