Household Casebearer (Plaster Bagworm)

Natural Habitat

Typically found inside houses, often on walls or floors, in humid climates and indoor environments with dust and spider webs.

Diet & Feeding

Larvae feed on spider webs and natural fibers like wool, human hair, and silk, as well as dead insects.

Behavior Patterns

The larva builds a flattened, spindle-shaped case out of silk and debris (like sand and dust) which it carries for protection. It can poke its head out of either end of the case to feed or move. After several molts, it pupates inside the case.

Risks & Benefits

They are considered minor household pests because they can damage silk or wool fabrics. They are not harmful to humans or pets and provide a small ecosystem benefit by scavenging spider webs and organic debris.

Identified on: 3/15/2026