Issue 3, May 11, 2015

Modified Growing Degree Days (Base 50°F,┬áMarch 1 through May 7)

Station Location

Actual Total

Historical Average (11 year)

One- Week Projection

Two-Week Projection

Freeport

277

209

345

416

St. Charles

266

203

331

397

DeKalb

270

233

344

421

Monmouth

362

270

443

527

Peoria

376

299

461

547

Champaign

379

299

466

556

Springfield

466

337

562

661

Brownstown

427

386

526

629

Belleville

492

407

595

701

Rend Lake

538

446

649

760

Carbondale

503

427

604

708

Dixon Springs

520

467

628

738

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 Department of Crop Sciences at the University of Illinois and the Illinois Water Survey). (Kelly Estes)

Author:
Kelly Estes

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