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  • MSU Extension
  • Michigan State University Ag Bio Research
  • Project Greeen

Cooley Spruce Adelgid Scouting for 2014 at Pigeon (Report issued 4/21/2014 1:16)

Use these predictions as guidelines to help time your scouting efforts.
Key event Timing
First adults active; egg laying begins. Expected to start in -6 DD (Base 50°F)
Eggs start to hatch; nymphs start to feed. Expected to start in 119 DD (Base 50°F)
Galls start to form. Expected to start in 169 DD(Base 50°F)
Current stage: Adults will be active soon.

Degree day total: 31 on 4/20/2014Degree day forecast: 39 on 4/21/2014

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: Open
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
Products registered for use in Christmas trees