Pacific Northwest Insect Management Handbook

Christmas tree (Douglas-fir)-Black pineleaf scale

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Nuculaspis californica

Pest description and crop damage Gray-black scale. Hosts: Douglas-fir and pine.

Management-chemical control

  • azadirachtin (AzaDirect and others)-Some formulations are OMRI-listed for organic production.
  • bifenthrin (OnyxPro, Sniper and others) (Group 3)-Restricted use pesticide
  • buprofezin (Talus and others) (Group 16)
  • dinotefuran (Safari 20 SG) (Group 4A)
  • horticultural oil (Ultra-Pure, 440 Superior Oil and others)-Test for phytotoxicity for any new product prior to widespread use. Some formulations are OMRI-listed for organic production.

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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