Palmer amaranth has been confirmed in five Iowa counties over the last two summers. The only (known) infestation in Muscatine County is on a very sandy soil near the Cedar River, and most emerged seedlings had at least four true leaves on May 4, 2015. This particular infestation has been intensively managed for just over a year, resulting in a significant decrease in its presence at the farm. This is very encouraging that with early discovery and good management, eradication may be possible.
Iowa State University
Anderson, Meaghan J. B., "Waterhemp’s Big, Bad Brother is Back This Spring" (2015). Integrated Crop Management News. 321.
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