Booklice & Psocid

Booklice & Psocid Identification and Control

Correct identification is an important first step in pest control.

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How to Identify Booklice/ Psocids

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. 

Where Do They Come From

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.  

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Where Can I Find Them

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.

Impact :

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

Tips & Tricks

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How To Prevent Booklice/Psocids

  • 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.
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About Booklice/Psocids

  • 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. Thorn can help.

Fill out the form below to contact us so we can help eliminate your problem fast.

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How To Control

Psocids and booklice can be difficult to control, but that’s what we are here for. We create a strategic plan to gain control of your problem and make sure we get results.

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Thorn's Approach

We take a scientific approach to psocid and booklice control. We start with an inspection and assessment to help us identify the pest, locate where they are, and create a specific plan for your property. Every home and business is different and requires a unique strategy.


Our Approach to Pest Control

Proper pest management starts with a detailed inspection and assessment from an expert pest professional before treatment. Thorn Pest Solutions uses a three-step process rooted in science to eliminate pests with long-term results.

Driven By Science. Lead By Service.

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Assess Situation

First, we identify the root problem(s) with a site assessment. Pests are almost always an indicator of an environmental condition. This will determine the best actions to provide short and your long-term results against pests.

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Execute Action Plan

Next, we develop a plan to fix the problems we discovered. This includes solving current pest issues, eliminating conducive conditions, and monitoring for future pest activity. Good pest management starts with a good plan.

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Track Success

Lastly, we implement the solutions we developed including inspection, monitoring, and preventing future pest infestations. Good pest control requires a good offense and not just defense. Prevention is key.

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