Palmer Amaranth weed was first found in Scioto County in 2012 today it has been found in 11 Ohio counties. This is a very bad weed and we must be on the lookout for it and destroy it as soon as we see it to prevent its spread. It was introduced into Ohio on seed used for CREP and wildlife seedings, manure from livestock that ate some types of cottonseed feed products and meal, and equipment that was used in southern states and brought into Ohio and not cleaned properly.
See this fact sheet on this weed species.
More information and a video on identifying this weed species can be found on our OSU Extension sites: