Issue 2, May 7, 2018

Modified Growing Degree Days (Base 50°F, March 1 through May 3)

Station Location

Actual Total

Historical Average (11 year)

One- Week Projection

Two-Week Projection

Freeport

134

173

199

268

St. Charles

145

169

206

271

DeKalb

131

194

201

276

Monmouth

181

228

256

339

Peoria

190

255

270

356

Champaign

191

254

272

361

Springfield

241

288

329

428

Perry

259

284

339

429

Brownstown

238

334

331

432

Belleville

255

254

250

455

Rend Lake

274

388

378

489

Carbondale

263

374

359

461

Dixon Springs

319

410

530

 

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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