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What to expect from herbicides in cold weather

May 8, 2020  By Kristen Obeid

As parts of Ontario brace for cooler weather in the coming week, Kristen Obeid, weed management specialist for Ontario’s Ministry of Agriculture, Food and Rural Affairs (OMAFRA), shares how these cold temperatures can impact herbicide performance.

The forecast is predicting temperatures to remain around 10 C next week, which is below the optimal temperatures of 16 to 27 C for herbicide performance. Obeid explains how the slow degradation of herbicides during cold weather could result in crop injury depending on the herbicide.

However, Obeid’s main takeaway is that now is the perfect time for pre-emergent herbicides and to save post-emergent herbicides for when temperatures climb above 16 C. Read the full analysis here.


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