Let's begin by addressing the term “pigweed.” Typically, when referring to pigweed, the first thing you need to consider is your location. If you are in Central Illinois, then most likely you are referring to waterhemp. If you are in West Tennessee, then pigweed most likely means Palmer amaranth (Palmer). Pigweed is a general term that can be used to describe most amaranthus species. Palmer amaranth is Amaranthus palmeri and tall waterhemp is Amaranthus tuberculatus (=A. rudis). You can see the confusion. In 2016, The Weed Science Society of America ranked waterhemp and Palmer in the top three most troublesome weeds for corn and soybean production; however, for the purpose of this article, “pigweed” will be considered Palmer.
Categories: CropTalk, 2019