Agricultural Impacts and Control
In North America, tall waterhemp is considered a major weed of agricultural fields and other disturbed habitats. The Southern Weed Science Society includes tall waterhemp on their list of weed species. However, it is not listed on the federal noxious weed list or any state lists in the United States. In Europe and other continents where the species has been introduced, naturalization is an infrequent occurrence.
Because of the long germination window for tall waterhemp, a single herbicide application is unlikely to be an effective control strategy. Michigan State University Extension recommends a preemergence application followed by one or more postemergence applications. Tall waterhemp have been reported resistant to acetolactate synthase inhibiting (ALS) herbicides and the triazines, with some individual weeds being resistant to both herbicides groups. Resistance to acifluorfen and other diphenyl ether herbicides has been reported. Even more alarming is the emergence of waterhemp resistant to the latest generation of herbicides, HPPD inhibitors.
According to Bob Hartzler of Iowa State University, the most effective control of tall waterhemp is achieved by cultural practices that promote growth of the desired vegetation.
Read more about this topic: Amaranthus Tuberculatus
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