Christmas Tree Insect Forecast Table

Degree Days (Base 50F)

Insect

Stage

25 – 100

Cooley Spruce Gall Adelgid

1^st. Adults Active

Eastern Spruce Gall Adelgid

1^st. Adults Active

Pales Weevil

1^st. Adults Active

Northern Pine Weevil

1^st. Adults Active

Zimmerman Pine Moth

1^st. Larvae

25 - 220

White Pine Weevil

1^st. Adults Active

European Pine Shoot Moth

1^st. Larvae

75 - 200

Eastern Pine Shoot Borer

1^st. Adults Active

100 - 150

Balsam Twig Aphid

Optimal control window

100 - 195

European Pine Sawfly

1^st. Larvae

150 - 180

Gypsy Moth

1^st. Larvae

150 - 200

Spruce Needleminer

1^st. Larvae

200 - 300

Balsam Gall Midge

1^st. Adults Active

Spruce Budworm

1^st. Larvae

Cooley Spruce Gall Adelgid

1^st. Galls

300 - 500

Pine Needle Scale 1^st generation

Optimal control window

300 - 350

Jack Pine Budworm

1^st. Larvae

Pine Root Collar Weevil

1^st. Adults Active

400 - 600

Pine Tortoise Scale

1^st. Crawlers

Pine Needle Midge

1^st. Adults Active

400 - 600

Redheaded Pine Sawfly

1^st. Larvae

Introduced Pine Sawfly

1^st. Larvae

450 - 600

Pine Chafer (Anomela Beetle)

1^st. Adults Active

700 - 800

European Pine Shoot Moth

Adults Active

700 - 900

Spruce Bud Scale

1^st. Crawlers

1200 - 1400

Pales Weevil

2^nd. Adults Active

Pine Root Collar Weevil

2^nd. Adults Active

White Pine Weevil

2^nd. Adults Active

Northern Pine Weevil

2^nd. Adults Active

(Note: The above weevil adults will be active from this point on through the rest of the growing season.)

1200 – 1500

Pine Needle Scale 2^nd generation

Optimal control window

1500 - 1600

Cooley Spruce Gall Adelgid

2^nd. Adults Active

Eastern Spruce Gall Adelgid

2^nd. Adults Active