Christmas tree (Spruce)-Cooley spruce gall adelgid

Adelges cooleyi

Pest description and crop damage Causes "pineapple" galls on spruce, the primary host.

See table:

Management-chemical control

Apply to control crawler stage, usually when new growth is expanding in spring.

  • bifenthrin (OnyxPro, Sniper and others) (Group 3)-Restricted use pesticide
  • cyantraniliprole (Mainspring GNL) (Group 28)
  • cyclaniliprole (Sarisa and others) (Group 28)
  • cyclaniliprole (Group 28) + flonicamid (Group 29)-Pradia
  • dinotefuran (Safari 20 SG) (Group 4)
  • imidacloprid (Montana, Nuprid 4F and others) (Group 4)
  • spirotetramat (Ultor, Movento) (Group 23)
  • thiamethoxam (Flagship 25 WG) (Group 4)