Issue 5, June 2, 2014

Modified Growing Degree Days (Base 50°F,¬† March 1 through May 29)

Station Location

Actual Total

Historical Average   (11 year)

One- Week Projection

Two-Week Projection

Freeport

558

436

647

762

St. Charles

450

414

532

638

DeKalb

466

479

561

680

Monmouth

560

533

659

783

Peoria

595

569

697

825

Champaign

625

583

733

866

Springfield

742

651

857

996

Brownstown

735

711

856

1000

Belleville

778

744

901

1040

Rend Lake

829

803

960

1112

Carbondale

827

760

952

1096

Dixon Springs

846

818

976

1124

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.

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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