Training Requirements and Application Reminders for XtendiMax® herbicide with VaporGrip® Technology


The Roundup Ready® Xtend Crop System, introduced in 2017, is designed to help control herbicide-resistant and tough-to-control broadleaf weeds in soybean. Two of the components of the system are Roundup Ready 2 Xtend® soybean and a dicamba formulation product, XtendiMax® herbicide with VaporGrip® Technology.

Dicamba and glyphosate herbicides can be utilized to manage weeds as a burndown, pre-planting/at planting, and as an in-crop option on Roundup Ready 2 Xtend® soybeans. Also, XtendiMax with VaporGrip Technology offers potential soil activity for up to 14 days on certain small-seeded broadleaf weeds depending on rainfall and soil type. The wide application window allows for control of small weeds (less than 4 inches) when they are more vulnerable, such as marestail at early burndown. The ability to use this product through the planting window will allow for Roundup Ready 2 Xtend soybeans to get a head start towards their high yield potential with minimal competition from weeds.

A weed management program should also include traditional residual herbicides in pre-emergence and post-emergence applications that have different sites of action. Targeting weeds that have not yet emerged or are small (less than 4 inches) will contribute to a more successful weed management program.

Use of XtendiMax with VaporGrip Technology has various application requirements including nozzle selection, set-back distances from sensitive areas, spray volume, etc. A few key points when applying XtendiMax with VaporGrip Technology include:

  • Do not use ammonium sulfate (AMS) or ammonium-based additives with XtendiMax with VaporGrip Technology.
  • Apply when wind speed measured at the boom is between 3 and 10 mph and do not spray during an inversion.
  • Do not exceed 15 mph ground speed.
  • Always read and follow the most current pesticide label requirements as application requirements may differ between Missouri and Kansas.

Additional up-to-date information about the Roundup Ready Xtend Crop System and the use of XtendiMax with VaporGrip Technology, including approved tank-mix partners and the use of drift reduction adjuvants (DRAs), are available at the following website:

Mandatory Training: Under the revised Environmental Protection Agency (EPA) registration for XtendiMax with Vapor Grip Technology, the product is now a restricted use pesticide and requires users to be a certified applicator (private or commercial) AND receive mandatory dicamba (auxin-specific) training.

In Missouri, dicamba training (synthetic auxin herbicide applicator training) is provided by University of Missouri Extension. Information on training dates/locations are available at Online training opportunities are also available.

In Kansas, training is provided by Kansas State University Research and Extension and industry companies. Information concerning training dates/locations offered by Kansas State University is available at,then select 2018 Dicamba Training. Monsanto-sponsored training dates/locations in Kansas are available at ​180127192902​​