Some insects can be helpful housemates, such as spiders that control pests. Others, like Phereoeca uterella—commonly known as kamitetep, plaster bagworms, or household casebearers—can be destructive. These moths thrive in warm, humid environments and feed on various household materials, making them a potential nuisance during summer months.

Kamitetep are more noticeable in their larval stage than as adults. The larvae carry gray, flat, cocoon-like cases that act as both camouflage and protection. These cases also serve as pupal shelters when the larvae mature into moths. The cases blend easily into surroundings like garden beds or home interiors, making early detection difficult.

Their life cycle includes four stages: egg, larva, pupa, and adult. Female moths lay small clusters of eggs in hidden areas. The larvae emerge and feed on organic material while building protective cases. They go through several molts before becoming pupae and, eventually, moths. Adults are small—only about half an inch—and covered in grayish-brown scales.

Kamitetep’s diet includes wool, silk, hair, dust, spiderwebs, and other organic debris, but they tend to avoid cotton. This broad diet allows them to infest various areas in a home, including basements, closets, garages, and attics. Unfortunately, they may damage clothing, linens, rugs, and even paper-based items.

Signs of infestation include their tubular cases hanging on walls or ceilings and larvae crawling nearby. Check around cardboard boxes, fabric storage areas, and light fixtures, where adults may gather. Their presence often signals a need for thorough cleaning.

To prevent or eliminate them, vacuum regularly, reduce moisture with dehumidifiers, and seal cracks where they may enter or lay eggs. In more severe cases, insecticidal treatments or pest control professionals may be needed. While not dangerous to humans or pets, kamitetep can become a persistent and damaging nuisance.