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

Cooley Spruce Adelgid Scouting for 2015 at Pigeon (Report issued 7/6/2015 13:46)

Use these predictions as guidelines to help time your scouting efforts.
Photograph of spruce gall adelgids: Overwinting immatures in early spring; Photo credit: Rayanne Lehman, Pennsylvania Department of Agriculture, Bugwood.org - See more at: http://www.forestryimages.org/browse/detail.cfm?imgnum=1123026
Click for larger image
Photo credit: Rayanne Lehman, Pennsylvania Department of Agriculture, Bugwood.org - See more at:
http://www.forestryimages.org/browse/detail.cfm?imgnum=1123026
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: 856 on 7/6/2015

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