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  • Dicamba-containing products for use in soybeans have continued to provide an additional tool in the weed management toolbox for tough to control, herbicide resistant weeds.
  • Illinois now has a section 24(c) label that restricts use after June 20th and impose a temperature restriction of 85 degrees Fahrenheit.
  • Additional application restrictions are required and should further limit off-target movement.
  • An integrated weed management approach is still needed to successfully manage our hard-to-control and resistant weed species.

It has been three years since the approval of XtendiMax®, Engenia®, FeXapan™, and one year since Tavium®’s approval for over-the-top use in dicamba-tolerant soybeans. These herbicide labels will be up for re-registration on December 20, 2020. This is a good opportunity to share some key successes over the past three years and a few changes to the new label for 2020 for applications in Illinois.

The most common comments after three seasons of dicamba-tolerant soybeans have been regarding the increased level of weed control that has been observed.This new technology has provided growers with an additional tool to manage tough to control and herbicide resistant weed species, especially waterhemp and marestail.While this has been the most noticeable success, one of the other successes has been the amount of training and expertise the FS System has obtained surrounding the application of these new products.Making the application at the right time and using the correct application practices have been paramount to the FS System to ensure the product is applied and stays on target.

To ensure applications remain on target, applications in a county with a known endangered species, need to have an omnidirectional buffer of 57 ft in addition to the 110 ft downwind buffer.Also, to reduce the potential for movement in a temperature inversion environment, the application must be made between the hours of 1 hour after sunrise and 2 hours before sunset.On October 11th, a section 24 (c) for Illinois restricts the use of these products to soybeans after June 20th. Post emergence applications can take place 45 days after planting or up to the R1 growth stage (first flower) whichever comes first, but no later than June 20th. These products are also not to be applied if the air temperature in the field at the time of application is over 85 degrees Fahrenheit OR if the National Weather Service has forecasted that the high temperature for the nearest available location for the day of application exceeds 85 degrees Fahrenheit. These revisions will further ensure that growers continue to have a positive experience with this technology.

While many have experienced the benefits of the Xtend system, we cannot forget that the success of this technology relies on a program approach.To manage weeds in the short and long term, we must utilize preemergence herbicides.Without one, we are likely to fail.When it comes to the POST emergence application, include an overlapping residual to manage weeds through crop canopy.When we take this chemical approach, along with cultural and mechanical control measures, we can start clean and stay clean throughout the season.

In the 2020 growing season, we look forward to the continued success of this weed control platform. Contact your local FS Crop Specialist with any questions regarding these label changes or to better understand how to apply any of the new dicamba herbicide formulations.

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