Household Casebearer Moth Larva

Indoors, especially in damp, dark areas like bathrooms, closets, and basements. They feed on natural fibers.

Larvae are scavengers, feeding on a wide variety of materials including wool, hair, lint, dead insects, spiderwebs, and sometimes synthetic fibers if mixed with natural ones.

The larva lives within a distinctive, flattened, grey, silken case covered in particles of debris. It carries this case wherever it goes, sticking its head and legs out to move and feed. When disturbed, it retracts completely into its case. They often leave a silken trail as they move. Pupation occurs within this same case.

Generally considered a nuisance pest, as their feeding can damage textiles, especially those made of natural fibers like wool and silk. They do not bite or sting and are not known to transmit diseases. They can indicate a problem with high humidity and the presence of organic debris in a home.