Pacific Northwest Insect Management Handbook

Christmas tree (Pine)-Pine bark adelgid

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Pinus strobi

Pest description and crop damage. Appear as white, woolly mass on trunk or stem. May severely distort new growth.

See table:

Hosts and Symptoms of Major Aphid and Adelgid Pests of Christmas Trees

Management-chemical control

  • bifenthrin (OnyxPro, Sniper and others) (Group 3)-Restricted use pesticide. Some products not registered for use in Washington.
  • carbaryl (Sevin and others) (Group 1A)
  • cyantraniliprole (Mainspring GNL) (Group 28)
  • cyclaniliprole (Sarisa and others) (Group 28)
  • cyclaniliprole + flonicamid (Pradia) (Group 28 + Group 29)
  • dinotefuran (Safari 20 SG) (Group 4A)
  • esfenvalerate (Asana XL and others) (Group 3A)-Restricted use pesticide.
  • horticultural oil (Drexel Damoil, Purespray Green and others)-Test for phytotoxicity for any new product prior to widespread use. Some formulations are OMRI-listed for organic production.
  • imidacloprid (Montana, Nuprid 4F and others) (Group 4A)-Some products not registered for use in Washington.
  • insecticidal soap (M-Pede and others)-Some formulations are OMRI-listed for organic production.
  • spirotetramat (Movento) (Group 23)

Kaur, N. (Ed.). 2026 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.

Trade-name products and services are mentioned as illustrations only. This does not mean that the participating Extension Services endorse these products and services or that they intend to discriminate against products and services not mentioned.