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Cutting Residual Herbicides in Soybeans is an Absolute No-Go

December 9, 2021
A soybean plot at our Grow More ExperienceTM site in Yarmouth, IA

A soybean plot at our Grow More ExperienceTM site in Yarmouth, IA, remained weed free into late August after a preemergence application of BroadAxe® XC herbicide and a post-emergence application of Tavium® Plus VaproGrip® Technology herbicide. Tavium is a premix that includes the active ingredient S-metolachlor (commonly known as Dual Magnum® herbicide) for residual control.

As you plan for the upcoming season, the first things that probably come to mind are inputs and the costs associated. But when it comes to saving a few upfront dollars on your weed management plan in soybeans, consider this first: cutting out residual herbicides from your planned post-emergence application will cost you more money and time in the long run.

Watch as Syngenta Agronomy Service Representative Zach Trower discusses the results of a 2021 trial in Yarmouth, IA, that highlights the importance of using a residual herbicide in planned post-emergence applications.

When comparing plots that have a post-emergence herbicide with no residual and a post-emergence herbicide with the residual, the effectiveness of the residual can easily be spotted in the late August soybean field. In the first plot, Prefix® herbicide was used as the preemergence application followed by Liberty® herbicide as the post-emergence application. Without the presence of the residual in the post-emergence application, weeds quickly took over the soybean crop.

The next plot also used Prefix as the preemergence and was followed by Liberty as the post-emergence. The difference? Sequence® herbicide was also applied post-emergence for residual weed control. And the results, well, they can quickly be identified between the two plots.

Sequence is a premix of glyphosate and S-metolachlor, commonly known as Dual Magnum herbicide. When Sequence, with the residual of Dual Magnum was added to the field, the results were clear: a nice clean field with higher yield potential. The first plot without a residual herbicide applied post-emergence was a prime example of what you don’t want.

So as you are planning for the 2022 growing season, remember that cutting residual herbicides is an absolute no-go.

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Product performance assumes disease presence.

Performance assessments are based upon results or analysis of public information, field observations and/or internal Syngenta evaluations. Trials reflect treatment rates commonly recommended in the marketplace.

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