Adelges cooleyi
Pest description and crop damage Adelgids appear as small cottony tufts on underside of needles. May cause yellowing, distortion, and premature needle drop. Aphids may distort stems.
See table:
Hosts and Symptoms of Major Aphid and Adelgid Pests of Christmas Trees
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. 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)