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Sponsored: Understanding Roundup Ready 2 Xtend and Enlist

A lot of people think that herbicide resistant weeds are a product of genetically modified crops (GMOs), specifically the overuse of glyphosate which is the active ingredient in Roundup. In actuality, they’ve been around much longer than that. According to the Weed Science Society of America, we’ve been fighting herbicide resistance for over 60 years. Since then, we’ve confirmed some form of herbicide resistance to over 250 different weeds in 66 countries! It’s because of this evolution of herbicide resistance that the industry has begun to seek new ways to control these problematic weeds.

Monsanto and Dow Agrosciences have developed new herbicide tolerant soybean traits that will offer farmers more options to control problematic weeds. I thought this would be a good opportunity to provide an overview of the Roundup Ready 2 Xtend® Crop System and the Enlist™ Weed Control System.

11.15_Understanding Xtend and Enlist

Roundup Ready 2 Xtend

Monsanto’s Roundup Ready 2 Xtend Soybeans will have the Genuity® Roundup Ready 2 Yield® trait stacked with tolerance to dicamba. That means that the soybeans will be tolerant to Roundup and dicamba after they have emerged. In the past, spraying dicamba anywhere close to emerged soybeans would have spelled disaster for sure, but with the genetic engineering from Monsanto, farmers now have the ability to use it without fear of crop injury. Previous formulations of dicamba were only allowed as a burndown herbicide and required a significant amount of time and rainfall before soybeans could be planted. Monsanto has developed a new, low-volatile formulation called Xtendimax™ with VaporGrip™. Now approved by the EPA, it has the ability to be used before and during the cropping season. All other dicamba formulations (Clarity®, Sterling Blue®, etc.) are not approved for overtop use during the cropping year. They have also developed a pre-mix of Roundup and their new low-volatile formulation of dicamba called Roundup Xtend™ with Vaporgrip™ which is still awaiting label approval. Roundup Ready 2 Xtend Soybeans currently have import approval from all major import countries. Please consult your local grain elevator for buying approval.

Beck's currently has 13 varieties available ranging from 2.3 to 4.9 relative maturity. Click here to see Beck’s full lineup of Roundup Ready 2 Xtend soybeans or her click here for more information. If you have additional questions or would like to place an order, contact your local Beck's dealer or seed advisor.


Dow Agroscience’s Enlist Weed Control System will have tolerance to three different herbicides: glyphosate (Roundup), glufosinate (Liberty®), and 2,4-D. This system utilizes two non-selective herbicides in glyphosate and glufosinate plus extra broadleaf protection with the 2,4-D tolerance. Glufosinate herbicide has no confirmed resistance in the United States, so it has been an excellent option to control herbicide resistant, but it can be weak on grasses if pressure is high. Enlist will allow farmers to spray glufosinate to control herbicide resistance weeds, while having the added grass protection of Roundup. Previously, 2,4-D could only be applied to soybeans as a burndown herbicide and required a specific plant back interval and seeding depth before soybeans could be planted. With the new Enlist Weed Control System, farmers will have the ability to use approved 2,4-D formulations during the cropping year. Dow Agroscience developed Enlist Duo® with Colex D® technology; a pre-mix of Roundup and 2,4-D for use in their cropping system. This is the only 2,4-D formulation approved for use post-emergence in soybeans. All other 2,4-D formulations will be strictly prohibited for use during the cropping year.

Enlist Duo® with Colex D® technology has been granted approval for use in several states (consult with your local authorities to see if your state has been approved), however, the Enlist™ trait is still awaiting import approval from several countries. As of now, Enlist soybeans will not be available for the 2017 growing season, but that could change if import approvals are granted.

Preventing Misapplications

Briefly, let’s discuss dicamba and 2,4-D. Both of these herbicides are group 4, synthetic auxins, which means they share the same mode of action. However, they have different sites of action. Simply put, this means they are similar in the way they move into a plant, but they are different in the way they ultimately kill a weed. If you plan on utilizing both of these systems on your farm, I would highly suggest flagging each technology with the appropriate color (Teal flag=Enlist, Black and White Checkered flag=Xtend) because a misapplication will kill the noncorresponding crop. Remember, these new technologies will not take the place of using residual herbicides! It will take multiple modes of action and good stewardship to keep these technologies available for future use.


Austin Scott, CCA | Field Agronomist

For more Agronomic News from Austin Scott, certified crop adviser, please visit his blog or his Agronomy Page on



Liberty® is a registered trademark of Bayer. Liberty® is not registered in all states. ®™Colex-D, Enlist and Enlist Duo are trademarks of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. Enlist Duo herbicide is not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow label directions. ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Roundup Ready® crops contain genes that confer tolerance to glyphosate, the active ingredient in Roundup® brand agricultural herbicides. Roundup® brand agricultural herbicides will kill crops that are not tolerant to glyphosate. Roundup Ready 2 Xtend® Soybeans contains genes that confer tolerance to glyphosate and dicamba. Glyphosate herbicides will kill crops that are not tolerant to glyphosate. Dicamba herbicides will kill crops that are not tolerant to dicamba. Roundup Ready 2 Xtend™, Roundup Xtend™, VaporGrip™ and XtendiMax™ are trademarks of Monsanto Technology LLC. Individual results may vary, and performance may vary from location to location and from year to year. This result may not be an indicator of results you may obtain as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible. Seeds containing the Genuity® Roundup Ready 2 Yield® or the Roundup Ready 2 Xtend® traits can only be used to plant a single commercial crop. It is unlawful to save and replant Genuity® Roundup Ready 2 Yield® or Roundup Ready 2 Xtend® soybeans. Additional information and limitations on the use of these products are provided in the Monsanto Technology Stewardship Agreement, the Monsanto Technology Use Guide, and 2016 Technology Use Guide Addendum to include Roundup Ready 2 Xtend® Soybeans. U.S. patents for Monsanto technologies can be found at the following webpage: Clarity® is a registered trademark of BASF Corporation. Sterling Blue® is a registered trademark of Winfield Solutions, LLC.

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