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Booklice & Psocid Identification and Control in Utah

Correct identification is an important first step in pest control.


When found indoors psocids, often called booklice, are very minute and are only 1/25 to 1/13 of an inch in length. Booklice can be found outdoors may be larger, up to 1/4 of an inch long.

These are very common in pest monitors-they look like small specks and will need a hand lens to identify. They may or may not have wings. The outdoor species of psocids are called barklice.

Psocids prefer warm, humid or damp places. Barklice, as psocid species that live outdoors are often called, live outdoors on or under bark, grass, leaves, damp wood, etc.

Thorn Pest Services Identify the pest with our Booklice & Psocid gallery

Where Can I Find Booklice/Psocids?
Where Can I Find Booklice/Psocids?

Booklice/Psocids can be found around damp books, leaking/sweating pipes, in voids, cracks and crevices, cupboards, in cardboard boxes or anywhere where mold growth cane supported.




Mold spores and fungal spores, starchy foods, eggs of grain moth.


Booklice and psocids are a nuisance pest indoors and are an indicator of moisture issues.

Thorn Pest Services Tips for keeping Booklice/Psocids away

How To Prevent Booklice/Psocids
Pest control experts
  • Vacuum the area.

  • Reduce relative humidity within trouble areas.

  • Store food items in pest-proof containers.

  • Remove leaf litter from around the exterior of structures.

About Booklice/Psocids
Pest control experts
  • Most psocids live outdoors but a few species specialize in living indoors.

  • Outdoor species are often referred to as “barklice”.

  • Psocids prefer warm, damp, and undisturbed areas.

  • Some psocids species have wings while others do not. Most indoor species do not have wings.

  • They mostly feed on microscopic molds but have been observed feeding on starchy paste and glue of book bindings and wallpaper.

Don’t let booklice or psocids take over.
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