Booklouse (or Psocid)

Natural Habitat

Found indoors in damp, warm, and undisturbed areas. Common on books, old paper, cardboard boxes, in cupboards, and occasionally on furniture or bedding if humidity is high.

Diet & Feeding

Feeds on microscopic fungi, molds, starches, and organic debris found in glues, book bindings, and damp paper.

Behavior Patterns

They do not bite humans or animals. They move in a jerky, run-and-stop motion. They thrive in high humidity environments which promote the mold growth they eat.

Risks & Benefits

Risks: Generally harmless to humans (no bites, no diseases transmitted). Can be a nuisance pest in large numbers and may cause allergic reactions in sensitive individuals. They can damage books and stored food products by contaminating them. Benefits: None significant in a household context, though they help break down organic matter in nature.

Identified on: 2/12/2026