Pacific Northwest Insect Management Handbook

Christmas tree (Pine)-Pine bark adelgid

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Pinus strobi

Pest description and crop dam 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 3A)-Restricted use pesticide
  • cyantraniliprole (Mainspring GNL) (Group 28)
  • cyclaniliprole (Sarisa and others) (Group 28)
  • cyclaniliprole + flonicamid (Pradia) (Group 28 + Group 29)
  • dinotefuran (Safari 20 SG) (Group 4A)
  • imidacloprid (Montana, Nuprid 4F and others) (Group 4A)-Apply to control crawler stage around bud break.
  • thiamethoxam (Flagship 25 WG) (Group 4A)

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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