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Crop Heat Units (CHUs) Corn 2025

Location Crop Heat Units as of May 1st 2025 CHU accumulation last year 
Harrow                                                                    
Ridgetown                                                                         
London                             
Sarnia                                                                

2025 CHU accumulations will commence on May 1, 2025. 

FYI , So far in April, from 1st to 27th at Harrow we have accumulated 176 CHU compared to a year ago of 176. It takes 160  CHU for emergence to occur.   

Growing Degree Days Winter Wheat Development January 2025 and forward

Location Growing Degree Day accumulation as of January  1st 2025 GDD accumulation last year 
Harrow 410 489
Ridgetown 358 471
London 309 411
Sarnia 354 465


 Updated April 27, 2025

Most of the wheat in SW is at Zadok's 30 to 31 Growth stage, weeds are growing and thick stands with > 70 stems per sq foot likely could use a PGR to reduce lodging potential. Tank mixing herbicides and PGR could save a pass,  watch night time temperatures below  5 C the day before, day of, and day after spraying . Applying after cold nights increases risk of leaf burn and potentially setting back yield 


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