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  • Michigan State University Ag Bio Research
  • Project Greeen

Cooley Spruce Adelgid Scouting for 2015 at Pigeon (Report issued 5/24/2015 15:03)

Use these predictions as guidelines to help time your scouting efforts.
Key event Timing
First adults active; egg laying begins. 4/14 through 5/7
Eggs start to hatch; nymphs start to feed. Started on 5/9 and expected to continue for 55 more DD (Base 50°F)
Galls start to form. Started on 5/17 and expected to continue for 55 more DD (Base 50°F)
Current stage: Galls are starting to be visible.

Degree day total: 267 on 5/24/2015

Treatment Guidelines for Cooley Spruce Adelgid

Soil Drench Treatment Window: Closed
NURSERY AND LANDSCAPE ONLY: If galls were a problem the previous year, apply a basal soil drench of imidacloprid or clothianidin in early spring (between 40 and 80 DD Base 50F).


Spring Foliar Treatment Window: Closed
If galls were a problem the previous year, apply an insecticide as foliar spray when the DD Base 50 F total is between 25 and 120.
Christmas tree insecticide recommendations and products registered for use