![]() ![]() In some cases, we grouped a couple of herbicide rates together if they were reasonably close. In each figure, you can see the waterhemp control provided by the specific herbicide and the number of observations that went into calculating the mean control for that herbicide. To compile this data set, we went through all of our herbicide screening field trials and compiled the waterhemp control data. The purpose of this article is to share some of the results we have generated in our research program over the last several years regarding the efficacy of single active ingredient, and multiple active ingredient premix herbicide products for waterhemp control. However, with the proliferation of premixed herbicide products, and some of the confusing marketing campaigns that we see, it can be difficult to pick a residual herbicide that best fits each weed control scenario. In addition, we know there are some other herbicides that have provided some control of waterhemp such as pendimethalin (Prowl), saflufenacil (Sharpen), fomesafen (one of the components in Prefix). These active ingredients include flumioxazin (Valor), sulfentrazone (Authority/Spartan), metribuzin (Sencor/Tricor), and the group 15 herbicides metolachlor (Dual), acetochlor (Warrant), pyroxasulfone (Zidua), and dimethenamid (Outlook). We have known for over 2 decades that there are a couple of active ingredients that have consistently provided good control of waterhemp, and have been positioned in the marketplace to go on those acres. Since waterhemp continues to infest more acres in the eastern cornbelt, it has become more important to target this weed as a “driver weed” as we select soil residual herbicides for soybean. When planning for this shortage, our most common message is to build your weed control program around a solid foundation of a residual herbicide, at a full labeled rate, so you can take some of the pressure off of your postemergence weed control tactics and reduce the reliance on glyphosate or glufosinate, particularly multiple treatments of these actives for protecting crop yields. This topic has even greater importance as we get closer to the 2022 growing season and the uncertainty about the supply of many of our commonly used postemergence herbicides, particularly glyphosate and glufosinate. One of the topics that we get many questions about is picking a residual herbicide for soybean production that helps with waterhemp control. ![]()
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