Issue 6, June 3, 2013

Modified Growing Degree Days (Base 50°F,  March 1 through May 30)

Station Location

Actual Temperature

Historical Average (11 year)

One-Week Projection

Two-Week Projection

Freeport

465

447

556

675

St. Charles

484

425

568

679

DeKalb

489

492

587

711

Monmouth

537

546

639

767

Peoria

570

583

675

807

Champaign

614

597

725

863

Springfield

652

666

770

913

Brownstown

666

727

789

937

Belleville

705

760

830

971

Rend Lake

774

821

907

1063

Carbondale

763

777

890

1038

Dixon Springs

773

836

904

1056

Insect development is temperature dependent. We can use degree days to help predict insect emergence and activity.  Home, Yard, and Garden readers can use the links below with the degree day accumulations above to determine what insect pests could be active in their area. Throughout the state, degree days accumulations have reached levels for increased activity of many borers and beetles.

GDD of Landscape Pests

GDD of Conifer Pests

Degree day accumulations calculated using the Illinois IPM Degree-Day Calculator (a project by the University of Illinois Department of Crop Sciences and the Illinois Water Survey). (Kelly Estes)

Author:
Kelly Estes

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