Ash Borer Degree Days
- 1st instar larvae = 275-500 DD50
Ash Plantbug Degree Days
- Nymphs = 100-200 DD50
Birch Leafminer Degree Days
- 1st generation larvae = 275-500 DD50
Black Vine Weevil Degree Days
- 1st generation adults = 400-600 DD50
- 2nd generation adults = 900-1000 DD50
Bronze Birch Borer Degree Days
- Larvae = 400-500 DD50
Cooley Spruce Gall Adelgid Degree Days
- Adults = 50-100 DD50
- Egg hatch = 210 DD50
- Galls forming = 250 DD50
- 2nd generation nymphs = 2800-3000 DD50
Cottony Maple Scale Degree Days
- Egg hatch = 850 DD50
- Crawlers = 900-1200 DD50
Eastern Spruce Gall Adelgid Degree Days
- Adults = 50-100 DD50
- Egg hatch = 90 DD50
- 1st instar larvae = 100 DD50
- 2nd generation nymphs = 2800-3000 DD50
Eastern Tent Caterpillar Degree Days
- Egg hatch = 50 DD50
- 1st instar larvae = 100 DD50
- 2nd instar larvae = 140 DD50
- 3rd instar larvae = 350 DD50
- Adults = 725 DD50
Elm Leaf Beetle Degree Days
- Larvae = 400-500 DD50
Elm Sawfly Degree Days
- Larvae = 365 DD50
Euonymous Scale Degree Days
- Crawlers = 500-700 DD50
European Pine Sawfly Degree Days
- 1st instar larvae = 50-100 DD50
European Pine Shoot Moth Degree Days
- Spring larvae active = 50-100 DD50
- Adults = 900 DD50
- Egg hatch = 200-100 DD50
Fall Webworm Degree Days
- Larvae = 850 DD50
Fletcher Scale Degree Days
- Adults = 100-200 DD50
- Egg hatch = 600 DD50
- Crawlers active = 900-1200 DD50
Gypsy Moth Degree Days
- Egg hatch = 100-200 DD50
- Larvae = 200-350 DD50
Hawthorn Leafminer Degree Days
- Larvae = 275-500 DD50
Honeylocust Plantbugs Degree Days
- 100-200 DD50
Imported Willow Leaf Beetle Degree Days
- 200-350 DD50
Japanese Beetle Degree Days
- Adults = 900-1200 DD50
Mountain Ash Sawfly Degree Days
- 500 DD50
Oystershell Scale (brown race) Degree Days
- Egg hatch = 265 DD50
- 1st generation crawlers = 275-500 DD50
- 2nd generation crawlers = 1600-1700 DD50
Oystershell Scale (grey race) Degree Days
- 1st generation crawlers = 400-600 DD50
Pine Needle Scale Degree Days
- 1st generation crawlers = 200-350 DD50
- 2nd generation crawlers = 1600-1700 DD50
Pine Spittlebug Degree Days
- 1st generation egg hatch = 145 DD50
- 2nd generation egg hatch = 1500 DD50
- 2nd generation crawlers = 1500-1600 DD50
Spruce Spider Mite Degree Days
- 100-200 DD50
Taxus Mealybug Degree Days
- 275-500 DD50
Viburnum Crown Borer Degree Days
- 1st instar larvae = 500-600 DD50
Zimmerman Pine Shoot Moth Degree Days
- 1st generation larvae (1st instar) = 100 DD50
- 2nd generation larvae (1st instar) = 2700-2900 DD50
Additional Images
Author: Karen Delahaut, UW-Madison Fresh Market Vegetable Program
Revised: 8/13/2012
Item number: XHT1088
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Calculating Degree Days
Degree Days for Common Fruit & Vegetable Insect Pests
Zimmerman Pine Moth
Japanese Beetle
