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.
- 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)
- imidacloprid (Montana, Nuprid 4F and others) (Group 4A)
- insecticidal soap (M-Pede and others)-Some formulations are OMRI-listed for organic production.
- spirotetramat (Ultor, Movento) (Group 23)
- thiamethoxam (Flagship 25 WG) (Group 4A)