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Crop Heat Units (CHUs) Corn 2025

Location Crop Heat Units as of May 1st 2025 CHU accumulation last year 
Harrow             37                                                        73
Ridgetown             29                                                                66
London             29                 70
Sarnia             26                                                           62

Updated May 4, 2025 

April 1 to April 30 we have accumulated 221 CHU compared to a year ago of 248. 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 499 611
Ridgetown 443 584
London 393 522
Sarnia 431 569


 Updated May 5, 2025

Most of the wheat in SW is at Zadok's 32 to 33 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 3 C the day before, day of, and day after spraying . Applying after cold nights increases risk of leaf burn and potentially setting back yield 

Early Sept planted wheat will most likely be in Flag leaf by next week. Stage the crop before applying herbicide. If the flag leaf is emerging  stop applying herbicide. 


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