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

Cooley Spruce Adelgid Scouting for 2015 at Pigeon (Report issued 8/3/2015 11:05)

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. 5/9 through 5/26
Galls start to form. 5/17 through 5/26
Current stage: Galls visible.

Degree day total: 1380 on 8/2/2015

Degree day forecast: 1483 on 8/9/2015

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