Some herbicides perform better than others in variable environmental conditions. Several management considerations need to be addressed with Some of those include: 1. Never apply glyphosate alone to emerged pigweed “Zero tolerance for adding weed seed to the soil should be every farmer’s goal.”. The battle against waterhemp is complicated mainly because of its extended emergence period (early May until August). Procedures: Objective 1. Having explored resistance issues with waterhemp and Palmer amaranth, let's turn our attention to discuss some control options for soybean in fields where resistance has been observed. CONTROL IN SOYBEAN. The blue line within each plot represents the median of data, while the diamond represents the average percent control over the 5-year period. “In today’s environment, there’s no such thing as an economic threshold for control of resistant weeds,” says Dr. Reid Smeda, University of Missouri weed scientist. Please visit our corn and soybean pages for information on a portfolio of products from Bayer to help you better manage weeds. AVOID WATERHEMP: All three Indiana CCAs agree that planning, residual herbicides and a targeted postemergence approach can control waterhemp in soybeans next year. Figure 1. without further permission if published as written and if credit is given to the author, Integrated Crop Management News, Marvel™ herbicide protects soybean yields with superior postemergence control of glyphosate-resistant weeds and broad-spectrum control of other key weeds, including waterhemp, Palmer amaranth/Palmer pigweed, lambsquarters, morningglories and velvetleaf. By Brian Hefty Everyone is talking about Roundup-resistant weeds. The use of PRE-emergence herbicides is a foundation for waterhemp control in soybeans. Group 15 herbicides (HG 15) are commonly used for PRE waterhemp control. Scout early and often. Efficacy of residual herbicides in a field varies from year to year due to environmental factors such as temperature and rainfall. Every meeting I went to this winter, every conference I attended, and every farm magazine I picked up, Roundup-resistant weeds were there. Prior to the evolution of herbicide resistance in waterhemp, ALS-, PPO-, EPSPS- and GS-inhibiting herbicides controlled waterhemp postemergence in soybean. Site A was in Seneca County, NY on a field of Odessa silt loam soil where waterhemp had survived various herbicide … “You could use glyphosate, but resistance continues to … Waterhemp has been the most troublesome weed for soybean farmers for the last 10 years. A well-thought-out herbicide program, using multiple sites of action, should be implemented to sustainably manage weeds. Although a member of the pigweed family – along with Palmer amaranth and redroot pigweed – waterhemp features several characteristics that differentiate it from other pigweed varieties. This premix combines three modes of action, each effective individually, to control resistant weeds. Farmers should always use full, labeled rates and herbicides with multiple sites of action from different classes of chemistry. If glyphosate resistance is known or suspected and there is no reason to believe the population is also resistant to PPO-inhibiting herbicides, apply a PPO-inhibiting herbicide such as Flexstar, Phoenix or Ultra Blazer to waterhemp shorter than 6 inches tall. Preemergence (PRE) soil residual herbicides serve as a foundation for managing waterhemp, but require follow-up treatments with effective postemergence (POST) products due to late-emerging plants. Waterhemp requires more than twice as many growing degree days to reach 50% emergence as giant foxtail or velvetleaf (Figure 1), resulting in much of the population emerging after mid-June. The answer can be summarized as follows: there are NO postemergence herbicides that will consistently control these very large weeds in soybean,… Group 14 herbicides are likely the best choice for POST-emergence control of glyphosate-resistant waterhemp in Roundup Ready soybeans. New herbicide promises control of waterhemp. Waterhemp resistance to HG 15 has not been confirmed yet in Iowa; however, it is important to proactively protect the value of these products for waterhemp control in soybean fields. Apply in the spring to control tough weeds like marestail, waterhemp, lambsquarters and ragweed. “You could use glyphosate, but resistance continues to increase every year. If applied too early, the control of Waterhemp declines. Time of application is very important. Postemergence Herbicides for Soybeans. Use effective soil applied herbicides at planting. Factors related Bayer has a broad herbicide portfolio to combat tough-to-control and resistant weeds. Authority Edge from FMC contains sulfentrazone + pyroxasulfone (HG 14 + 15) and will be available for use in soybean in 2020. Season-long competition by waterhemp (more than 20 plants per square foot) has been shown to reduce soybean yield by 44%. Use full labeled rates; For postemergence treatments, make timely applications and apply to small pigweed (<4 inches tall). Waterhemp management in soybeans was a challenge for several farmers in 2018. the author is required. If you’re a soybean grower, you really have only four classes of postemergence herbicides to throw at waterhemp. Waterhemp can grow at the incredible rate of 1 to 1 1/4 inches per day, so timely herbicide application is critical. In an effort to use multiple effective SOAs to control waterhemp populations, we evaluated the performance of layering Group-14 Valor® SX followed by Group-15 Dual II Magnum. Comparison of common waterhemp control with layered (PRE/POST) applications of three Group-15 herbicides and layered (PRE/POST) Group-14 / Group-15 herbicides in soybeans, Rochester, 2016. AVOID WATERHEMP: All three Indiana CCAs agree that planning, residual herbicides and a targeted postemergence approach can control waterhemp in soybeans next year. With dwindling herbicide resources, there is a need to integrate non-chemical strategies into current weed management programs in soybean. A follow-up application of HG 15 is recommended at the POST timing as part of a layered residual program in soybean. Waterhemp Management in Soybeans Waterhemp Biology • Waterhemp gains a competitive advantage over several more aggressive summer annual weeds through the sheer number of plants that can infest an area. Farmers also can use several cultural practices to control waterhemp. Soybean fields with emerged waterhemp, where glyphosate has struggled in the past to control the weed, should receive priority for spraying. Results from 2015 are described in the Crop News article, Manage waterhemp in soybean with layered residual herbicides.
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