If you have a field where the weeds (including waterhemp) have gotten tall and you DON'T suspect you have any glyphosate-resistant weeds present, then our research shows that increasing the rate of glyphosate will generally provide as good or better weed control than adding a tank-mix partner to glyphosate in Roundup Ready soybeans. Classic 25DF (chlorimuron) also provides fair to good control of yellow nutsedge. Killing old stands of alfalfa _____ 3 3. The battle against waterhemp is complicated mainly because of its extended emergence period (early May until August). This will give you 3 residual sites of action and 99.9% control on all the weeds I listed above. Anecdotal observations suggest the effectiveness of glyphosate for waterhemp control is not always as consistent as it once was. 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. Each is a "contact" herbicide, so thorough coverage of the target vegetation is essential for good control. Last year, Corteva received final import approvals in the spring and were able to release a limited commercial launch of the soybean trait. 2017). Giant ragweed seeds are degraded relatively quickly, with over 95% of the weed seeds being degraded in 2 years according to recently published U of MN research (Goplen et al. If you have a field where the weeds (including waterhemp) have gotten tall and you DON'T suspect you have any glyphosate-resistant weeds present, then our research shows that increasing the rate of glyphosate will generally provide as good or better weed control than adding a tank-mix partner to glyphosate in Roundup Ready soybeans. It’s here, it’s ugly, and it won’t go away, but you can still fight waterhemp in soybeans with existing technologies, according to University of Illinois (U of I) weed experts. Photo by Dallas Peterson, K-State Research and Extension. However, there are no effective herbicide options to control waterhemp resistant to both glyphosate and PPO inhibitors in conventional or glyphosate-resistant soybean varieties. One of the biggest broadleaf weed problems growers across the country face is the pigweed family: spiny, smooth and redroot pigweed; Palmer amaranth; waterhemp; and several other species. Glyphosate-Resistant Waterhemp Moves into the Corn Belt . General Burndown herbicides for Palmer amaranth and waterhemp. Waterhemp and Palmer amaranth. Waterhemp – all populations resistant to ALS inhibitors, most resistant to glyphosate, some resistant to PPO inhibitors also. Fredericks, who uses Enlist Soybeans that uses 2-4-D spray technology, estimates half the soybean fields planted in his area were Extend Soybeans (which uses Dicamba technology). Weed scientists say they have data that shows even if waterhemp plants don’t emerge from the soil until soybeans are at the V5 stage, they can still reduce yields up to 10%. 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