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2019 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 recently based on off-target movement (drift) complaints.

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


  1. Agricultural Ground Applied Drift Complaints to OISC to date (09-17-19) (pdf, 175kb)
  2. Dicamba Frequently Asked Questions (01-30-19) (pdf, 279kb)
  3. 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.

  4. Ground Truthing Weather Apps for Wind Speed and Temperature Inversions
  5. Counties with Endangered Species (11-26-18) (pdf, 99kb)
  6. Dicamba RUP Dealer Notice (11-20-17) (pdf, 869kb)
  7. Registrants of Dicamba-Containing Agricultural Herbicide Products Notice (12-20-17) (pdf, 39kb)
  8. List of state RUP dicamba herbicides (04-19-19) (pdf, 80kb)
  9. Final Rule - Restricted Use Classification of Dicamba Containing Herbicides
  10. Options for Dealing with a Pesticide Drift Incident (PPP-110) (pdf, 658kb)
  11. How to File a Fertilizer or Pesticide Complaint (pdf, 30kb)
  12. Filing a Pesticide or Fertilizer/Manure Complaint (pdf, 86kb)
  13. Understanding Soybean Response to Dicamba (BASF) (pdf, 1,333kb)
  14. Association of American Pesticide Control Official (AAPCO) Dicamba page
  15. Removing Herbicide Residues from Agricultural Application Equipment (How Proper Cleaning Helps Prevent Crop Damage and Improves Performance)
  16. Response of Roundup Ready Soybean Yield to Dicamba Exposure (source: Purdue Extension)
  17. Response of Glyphosate-Tolerant Soybean Yield Components to Dicamba Exposure (source: ResearchGate)
  18. DriftWatch Sensitive Crop/Site Registry (source: DriftWatch)
  19. What Have We Learned from Four Years of Studying Temperature Inversions? (source: University of Missouri)
  20. Five Things We've Learned About Dicamba (source: University of Missouri)