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Dicamba Herbicide Updates

Dicamba containing herbicides, including formulations such as XtendiMax with VaporGrip Technology (EPA Reg. No. 524-617), Engenia Herbicide (EPA Reg. No. 7969-345), FeXapan Herbicide Plus VaporGrip Technology (EPA Reg. No. 352-913), and Tavium Plus VaporGrip Technology (EPA Reg. No. 100-1623) have been in the news and under review by state and federal pesticide regulators since 2017, based on excessively high numbers of off-target movement (drift and volatilization) complaints.

This website is intended to provide interested parties with regulatory and other related information associated with dicamba herbicides in Indiana.

Dicamba Use in Indiana after June 3, 2020:


If you are reading this, you are probably already aware that on June 3, 2020 the United States Court of Appeals for the Ninth Circuit issued an opinion vacating the federal registrations for the dicamba herbicides Engenia (EPA Reg. No. 7969-345), FeXapan (EPA Reg. No. 352-913), and Xtendimax (EPA Reg. No. 524-617). The federal registration for Tavium (EPA Reg. No. 10-1623) is NOT impacted by this opinion.

View the opinion (pdf, 237kb)


Indiana state pesticide law allowed the continued distribution and use of these products in Indiana from June 3, 2020 through June 8, 2020. On June 8, 2020, the U.S. EPA issued a cancellation order (view the cancellation order) for the three impacted dicamba products. In summary, that federal cancellation order requires the following:

  1. Distribution or sale by the registrant. Distribution or sale by the registrant (BASF, Bayer and Corteva) of all existing stocks of the three products listed above is prohibited effective as of the time of the order on June 3, 2020, except for distribution for the purposes of proper disposal.

  2. Distribution or sale by persons other than the registrant. Distribution or sale of existing stocks of the three products listed above that are already in the possession of persons other than the registrant is permitted only for the purposes of proper disposal or to facilitate return to the registrant or a registered establishment under contract with the registrant, unless otherwise allowed in item #3 or #4 below.

  3. Distribution or sale by commercial applicators. For the purpose of facilitating use no later than July 31, 2020, distribution or sale of existing stocks of the three products listed above that are in the possession of commercial applicators is permitted.

  4. Use. Use of existing stocks of products listed above inconsistent with any respect with the previously-approved labeling accompanying the product is prohibited.

In addition to the above listed restrictions in the federal cancellation order, it is important to note that the state registrations for these products require that use may NOT occur after JUNE 20, 2020, regardless of any other state or federal action on these registrations.


Questions may be directed to Dave Scott at, or 765-494-1593.


  1. OISC Drift Data (07-31-20) (pdf, 442kb)
  2. Dicamba 24(c) Press Release (11-13-19) (pdf, 188kb)
  3. FIFRA Sec. 24(c) State Labels for June 20, 2020 Application Cut-Off Date:
    - Engenia 24c (12-05-19) (pdf, 191kb)
    - FeXapan 24c (11-05-19) (pdf, 140kb)
    - Tavium 24c (11-13-19) (pdf, 110kb)
    - Xtendimax 24c (12-13-19) (pdf, 133kb)
  4. 2020 Engenia, Xtendimax, Fexapan, and Tavium Application Quick Guide (pdf, 1.18MB)
  5. Analysis of Off-Target Movement of Dicamba Herbicides in Indiana (10-30-19) (pdf, 325kb)
  6. Dicamba 2019 Off-Target Movement Response and Plans for 2020 (11-06-19) (pdf, 1.32MB)
  7. Dicamba Frequently Asked Questions (01-30-19) (pdf, 279kb)
  8. SFIREG Dicamba Guidance (07-25-19) (pdf, 694kb)

    SFIREG is a formal nationwide committee of state pesticide regulatory agency representatives created to allow for coordination and collaboration between states and U.S. EPA on matters related to pesticide regulation. In late 2018 the SFIREG EPA Dicamba Work Group was formed in response to EPA's decision extending the registration of dicamba for two years for “over-the-top” use (application to growing plants), to control weeds in fields for cotton and soybean plants genetically engineered to resist dicamba. The Work Group's charge is to address issues related to this decision including but not limited to label interpretation, training, enforcement and endangered species. SFIREG Work Group members represent Iowa, Arkansas, Indiana, Nebraska, Minnesota, Texas, Georgia, North Carolina, Missouri and Oregon.

    The Work Group has developed the following guidance document which is intended to serve as a resource for pesticide regulatory officials. The guidance is a living document and as additional items, understandings, or interpretations are brought to the group, it will be revised accordingly. The items in black have been agreed upon by the SFIREG Work Group members and those in blue represent items for which there is general consensus however continue to be refined.

  9. Ground Truthing Weather Apps for Wind Speed and Temperature Inversions
  10. Counties with Endangered Species (11-26-18) (pdf, 99kb)
  11. Dicamba RUP Dealer Notice (11-20-17) (pdf, 869kb)
  12. Registrants of Dicamba-Containing Agricultural Herbicide Products Notice (12-20-17) (pdf, 39kb)
  13. List of state RUP dicamba herbicides (07-30-20) (pdf, 64kb)
  14. Final Rule - Restricted Use Classification of Dicamba Containing Herbicides
  15. Options for Dealing with a Pesticide Drift Incident (PPP-110) (pdf, 658kb)
  16. How to File a Fertilizer or Pesticide Complaint (pdf, 30kb)
  17. Filing a Pesticide or Fertilizer/Manure Complaint (pdf, 86kb)
  18. Understanding Soybean Response to Dicamba (BASF) (pdf, 1,333kb)
  19. Association of American Pesticide Control Official (AAPCO) Dicamba page
  20. Removing Herbicide Residues from Agricultural Application Equipment (How Proper Cleaning Helps Prevent Crop Damage and Improves Performance)
  21. Response of Roundup Ready Soybean Yield to Dicamba Exposure (source: Purdue Extension)
  22. Response of Glyphosate-Tolerant Soybean Yield Components to Dicamba Exposure (source: ResearchGate)
  23. DriftWatch Sensitive Crop/Site Registry (source: DriftWatch)
  24. What Have We Learned from Four Years of Studying Temperature Inversions? (source: University of Missouri)
  25. Five Things We've Learned About Dicamba (source: University of Missouri)
  26. Dicamba Losses to Air after Applications to Soybean under Stable and Nonstable Atmospheric Conditions (pdf, 3.1MB)
  27. Inversion Climatology in High-Production Agricultural Regions of Missouri and Implications for Pesticide Applications (pdf, 12.8MB)