Pacific Northwest Insect Management Handbook

Nuisance and household pests-Booklouse

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Common booklouse

M. R. Bush, WA State University

Order Psocodea (formerly Psocoptera)

Pest description and damage Booklice (Psocids) are brownish yellow insects about the size of a pinhead. They prefer moist, undisturbed conditions.

Management

Eliminate entry points with caulk. Reduce moisture and increase light and air circulation. Fans and dehumidifiers are recommended. Apply labelled pesticides to cracks and crevices where appropriate.

For further information:

Booklice. Insect Advice from Extension. Pennsylvania State University. https://ento.psu.edu/extension/factsheets/booklice

Kaur, N. (Ed.). 2024 Pacific Northwest Insect Management Handbook.
© Oregon State University.

Use pesticides safely!

  • Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
  • Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
  • Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

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