Household Casebearer (often confused with Plaster Bagworm)

Natural Habitat

Often found indoors on walls, in corners, underneath furniture, and in closets. They thrive in humid environments like Florida and the tropics.

Diet & Feeding

Larvae feed on old spider webs, wool, hair, lint, dead insects, and fibers. They are detritivores.

Behavior Patterns

The larva constructs a distinctive flattened, pumpkin-seed-shaped case out of silk and debris (sand, soil, frass, lint) which it drags around as it moves. The larva lives inside this protective shell and can pop its head out from either end to move or feed.

Risks & Benefits

Risks: Generally considered a minor household pest. They do not bite or sting humans, but they can damage wool clothing, rugs, or fabrics if an infestation is large. Benefits: They clean up minor organic debris like spider webs and dead bugs, though this benefit is usually outweighed by their nuisance status.

Identified on: 3/10/2026