Christmas tree (Common pests)-Conifer aphid

Cinara occidentalis and Cinara abietis

Pest description and crop damage C. abietis are large, dark aphids typically feeding on upper stems and tended by ants. May distort stems. C. occidentalis feed at the base of needles on 1 year and older foliage, often in the lower portion of the tree and may be quite damaging.

See table:

Management-cultural control

C. abietis is easily spotted and often controlled by squishing colonies by hand or spot spraying. Minor outbreaks of both species may be kept in check with beneficial insect predators or spot treatments.

Management-chemical control

  • azadirachtin (AzaDirect and others)-Some formulations are OMRI-listed for organic use.
  • bifenthrin (OnyxPro, Sniper and others)-Restricted use pesticide. (Group 3)
  • Chromobacterium subtsugae (Grandevo)-OMRI-listed for organic use.
  • cyantraniliprole (Mainspring GNL)-(Group 28)
  • cyclaniliprole (Group 28) + flonicamid (Group 29)-Pradia
  • dinotefuran (Safari 20 SG)-(Group 4)
  • flupyradifurone (Altus)-(Group 4)
  • imidacloprid (Admire Pro, Prey 1.6 and others)-(Group 4)
  • insecticidal soaps and oils (Ecotec, M-pede, 440 Superior Oil, Ultra-Pure Oil and others)-Some formulations are OMRI-listed for organic use.
  • malathion (organophosphate) (various formulations)-(Group 1)
  • pymetrozine (Endeavor and others)-(Group 9)
  • spirotetramet (Ultor, Movento)-(Group 23)
  • sulfoxaflor (Transform WG)-(Group 4c) SNL registration label not on PICOL expires 07/01/2022
  • thiamethoxam (Flagship 25 WG)-(Group 4)

Management-biological control

  • aphid predators (Aphidoletes aphidimyza, Aphidius spp., Hippodamia spp., Chrysopa spp.)-Consider attracting predators with forage plantings and using products with low toxicity to predators.