ALS resistant waterhemp has been documented near the RRV of MN after commonly infesting mid-west and plains states. Weeds species most likely to develop resistance are genetically variable and have a rapid like cycle with short seed dormancy such as kochia and Russian thistle. Rotate herbicides with different modes of action in consecutive years. Apply herbicides in tank-mix, prepackage or sequential mixtures that include multiple modes of action. Rotate crops, particularly those with different life cycles, Combine mechanical weed control practices like rotary hoe and cultivation with herbicide treatments.
Scout fields regularly and identify weeds that escape herbicide treatments.
Monitor changes in weed populations and restrict spread of potentially resistant weeds that match the field history and a herbicide use pattern. Clean tillage and harvest equipment before moving from fields infested with resistant weeds to those that are not. Use the color-coded brochure to assist in herbicide management and selection to reduce resistant weed development. This information is from the 1999 ND Weed Control Guide. Refer to it for more information.