While the evolution of herbicide resistance in weeds is not a new issue, and Iowa has long had weeds with resistance to herbicides, there have not been any field-scale problems with resistance to glyphosate or PPO inhibitor herbicides identified. Iowa State University Weed Science has always recommended that growers utilize a diverse weed management program and not focus on one herbicide that is applied repeatedly.
Iowa State University
Owen, Michael D., "Concerns about Herbicide Resistant Weeds in Iowa" (2009). Integrated Crop Management News. 593.
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