Pacific Northwest Insect Management Handbook

Christmas tree (True fir)-Conifer root aphid

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Prociphilus americanus

Pest description and crop damage Tree above ground is stunted and off-color. Below ground colonies of white aphids attached to roots often tended by small ants. In severe cases, replanting may be required as unhealthy trees are slow to recover.

See table:

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

Management-chemical control

  • spirotetramat (Ultor, Movento) (Group 23)-Appropriate surfactant necessary.
  • thiamethoxam (Flagship 25 WG) (Group 4A)

Christmas Tree Export Pests

Many insects have export restrictions, but the pests listed below do not cause tree damage so are listed separately.

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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