Herbicide carryover risk will not be as great as the past few years due to some decent spring rainfall. However, the risk is greater for in-season crop applications due to a sharp reduction in rainfall from July onward.

The Saskatchewan Ministry of Agriculture has released the herbicide carryover maps for pre-seed, early in crop and late season crop applications. The Ag Ministry recommends checking the “Guide to Crop Protection for a list of residual herbicides and always read the label for specific recropping instructions.”

There is a low risk across the province for the pre-seed application, with some medium to higher risk zone for the early in-crop herbicide applications.

Cory Jacob, the Provincial Oilseed specialist with the Saskatchewan Ministry of Agriculture, says areas around Leader, Swift Current, Maple Creek, Assiniboia, Coronach, and Lloydminster showed a moderate to high risk of herbicide carryover, based on rainfall from June 1 to September 30, 2024.

The risk areas are more extensive for later season crop applications. The map showing rainfall from June 15 to September 30, 2024 shows the moderate to high risk for herbicide carry over expands to Meadow Lake, Prince Albert, Nipawin, Hudson Bay, Rosetown, Outlook, Wynyard, and Moose Jaw. A pocket around Assiniboia shows very high to severe risk while Coronach has a very high risk for later season crop applications.

The maps are based on rainfall data gathered in the weekly Saskatchewan Agriculture crop reports. Jacob suggests using local rainfall data for more accurate results.

You can check out all three herbicide carryover risk maps for 2025 on the Saskatchewan Agriculture website.

(CJWW)