Dicamba / Auxin Information

EPA Announces 2020 Dicamba Registration Decision

At the Cromley Farm, U.S. Environmental Protection Agency (EPA) Administrator Andrew Wheeler announced that EPA is approving new five-year registrations (2025) for two dicamba products (XtendiMax with VaporGrip Technology and Engenia Herbicide) and extending the registration of an additional dicamba product (Tavium Plus VaporGrip Technology). All three registrations include new control measures to ensure these products can be used effectively while protecting the environment, including non-target plants, animals, and other crops not tolerant to dicamba.


The following herbicide products are Restricted-Use Pesticides (RUPs). This means that you have to be a Certified Pesticide Applicator to both buy AND apply (this includes mixing and loading) these products. However these product also have additional requirements for their use.

Engenia™ [EPA Reg No 7969-345] – BASF
XTendiMax® with VaporGrip® Technology [EPA Reg No 524-617] – Bayer / Monsanto
Tavium Plus VaporGrip Technology® [EPA Reg No 100-1623] – Syngenta

Registration renewed till 2025 with additional conditions:

  • Requiring an approved pH-buffering agent (also called a Volatility Reduction Agent or VRA) be tank mixed with OTT dicamba products prior to all applications to control volatility.
  • Requiring a downwind buffer of 240 feet and 310 feet in areas where listed species are located.
  • Prohibiting OTT application of dicamba on soybeans after June 30 and cotton after July 30.
  • Simplifying the label and use directions so that growers can more easily determine when and how to properly apply dicamba.

Previous restrictions.

  • Only certified applicators may apply dicamba over the top (those working under the supervision of a certified applicator may no longer make applications).
  • Prohibit over-the-top application of dicamba on soybeans 45 days after planting and cotton 60 days after planting.
  • For cotton, limit the number of over-the-top applications from 4 to 2 (soybeans remain at 2 OTT applications).
  • Applications will be allowed only from 1 hour after sunrise to 2 hours before sunset.
  • In counties where endangered species may exist, the downwind buffer will remain at 110 feet and there will be a new 57-foot buffer around the other sides of the field (the 110-foot downwind buffer applies to all applications, not just in counties where endangered species may exist). – June 2020
  • Clarify training period for 2019 and beyond, ensuring consistency across all three products.
  • Enhanced tank clean out instructions for the entire system.
  • Enhanced label to improve applicator awareness on the impact of low pH’s on the potential volatility of dicamba.
  • Label clean up and consistency to improve compliance and enforceability.

Additional Dicamba – Auxin Training:

To USE these products you will have to go through additional training above and beyond the training you receive to get certification as an Commercial or Private applicator.  This training is a label requirement to use the products and failure to get this training (and poof of for your records) is a label violation.  The State of Wisconsin will accept Dicamba – Auxin training provided by either the product manufacturers (live or web) OR state training (web or live) where a certificate or proof of training is issued.  The following options are available. We will list more as they are made available.

Nebraska State University Online Training

What you need to know to Know When You Use the New Dicamba Products – Wisconsin Department of Agriculture, Trade and Consumer Protection

Manufacturer Training:

BASF Training Schedule.

Bayer Training and Stewardship Site.

Additional Help:

Wisconsin Department of Agriculture, Trade and Consumer Protection – Dicamba page

Dicamba Product 2021 – DATCP informational brochure.

Example of a recordkeeping form – This example is for Engenia™, BASF.

Example of a recordkeeping form – This example is for XtendiMax™, Monsanto

Applicator Tips for Using the New DIcamba Products – University of Minnesota

List of Apps that may help – CropLife: “Mobile Apps, Online Tools for Dicamba Applications.”

EPA Endangered Species Bulletin – June 2020 –  If you are applying in the pink area, you must also add a 57 foot buffer in all directions.

These products all have additional recordkeeping requirements. Be aware that some requirements are above and beyond the normal RUP recordkeeping requirements.  Records must be kept for 2 years.  The information below was adapted from the XtendiMax® label:

1. Required by Normal RUP records.
a. Brand or product name
b. EPA Registration Number
c. Total amount applied
d. Month, day, year
e. Location of application
f. Crop, commodity, stored product, or site
g. Size of treated area
h. Name of certified applicator
i. Certification number

2. Training Date and Provider of required training completed and proof of completion.

3. Receipts of Purchase: Receipts or copies for the purchase.

4. Product Label: A copy of the label, and any state special local need labels that supplement the label.  Wisconsin does not have any at this time.

5. Buffer Requirements: Record of the buffer distance calculation and any areas included within the buffer distance calculations; for example roads.  Remember ditches and natural areas can not be included in this calculation.

6. Susceptible Crops Awareness: Records of sensitive crop registry was consulted or document surveying neighboring fields prior to application. In Wisconsin, this means that you have to provide some record of identifying you did this. Meaning contacting your neighbors or taking stock of what is around you.

7. Start Finish Times of Each Application: If you are a Commercial Applicator in Wisconsin, you will need to do this anyway.

8. Application Timing: Record type of application (for example: pre-emergence, post-emergence) and the number of days after planting if post-emergence.

9. Air Temperature: Start and finish air temperature at start and finish.

10. Wind speed and direction: Start and finish of application at boom height.

11. Nozzle and Pressure: Record the nozzle manufacturer/brand, type, orifice size (Gallons Per Minute GPM) and operating pressure during each application.

12. Tank Mix Products: Brand names and EPA Reg No. if available for ALL products put in the tank. Even if they products are not pesticides or RUPs.

13. Spray System Clean out: A record of compliance that the clean out procedure was followed.