Southeast Research and Demonstration Farm
Waterhemp that is no longer effectively controlled by glyphosate is becoming more common in many fields in Iowa. It also is becoming more common for herbicides with other modes of action to be ineffective against this troublesome weed. Farmers need to be aware of management systems to prevent this resistance problem from occurring in their fields and to know how to deal with the problem.
Iowa State University
Fawcett, Jim and Brenneman, Greg, "Management of Glyphosate-resistant Waterhemp" (2014). Iowa State Research Farm Progress Reports. 2067.