Booklouse

Natural Habitat

Damp, warm areas with high humidity such as bathrooms, kitchens, behind wallpaper, or in stored grain and old books.

Diet & Feeding

They feed on microscopic fungi, mold, algae, starch (such as wallpaper paste and book bindings), and organic debris.

Behavior Patterns

They are wingless, soft-bodied insects that prefer dark, moist environments. They are active year-round indoors and exhibit a jerky, rapid running movement when disturbed.

Risks & Benefits

They do not bite humans or pets and do not spread disease, but in large numbers, they can contaminate food pantry items or damage delicate paper goods and old book bindings. They are primarily a nuisance indicator of high humidity levels.

Identified on: 4/26/2026