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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.

  1. On October 27, 2020, the U.S. EPA accepted new labels for several dicamba products intended for over-the-top use in soybeans. The new federal registrations are currently scheduled to extend through 2025. A number of significant additional application requirements and restrictions have been added to these new labels, as compared to last year’s labels. The Office of Indiana State Chemist (OISC) is currently in the process of analyzing these new labels to determine the acceptability for state registration in Indiana. As part of that analysis, OISC is seeking a review and information collection effort to be facilitated through the Indiana Pesticide Review Board (IPRB) at their scheduled meeting on November 18, 2020 ( In preparation for that meeting, OISC is also evaluating how those new label requirements might be implemented and enforced in Indiana. Interested parties are encouraged to attend the November 18, 2020 IPRB meeting. The meeting will be conducted both in-person and as a web meeting.

  2. 2020 EPA Dicamba Registration Frequently Asked Questions (source: EPA)
  3. Analysis of Off-Target Movement of Dicamba Herbicides in Indiana (10-30-19) (pdf, 325kb)
  4. Dicamba Frequently Asked Questions (01-30-19) (pdf, 279kb)
  5. SFIREG Dicamba Guidance (07-25-19) (pdf, 694kb)
  6. Ground Truthing Weather Apps for Wind Speed and Temperature Inversions
  7. Counties with Endangered Species (11-26-18) (pdf, 99kb)
  8. Final Rule - Restricted Use Classification of Dicamba Containing Herbicides
  9. Removing Herbicide Residues from Agricultural Application Equipment (How Proper Cleaning Helps Prevent Crop Damage and Improves Performance)
  10. Response of Roundup Ready Soybean Yield to Dicamba Exposure (source: Purdue Extension)
  11. Response of Glyphosate-Tolerant Soybean Yield Components to Dicamba Exposure (source: ResearchGate)
  12. DriftWatch Sensitive Crop/Site Registry (source: DriftWatch)
  13. What Have We Learned from Four Years of Studying Temperature Inversions? (source: University of Missouri)
  14. Five Things We've Learned About Dicamba (source: University of Missouri)
  15. Dicamba Losses to Air after Applications to Soybean under Stable and Nonstable Atmospheric Conditions (pdf, 3.1MB)
  16. Inversion Climatology in High-Production Agricultural Regions of Missouri and Implications for Pesticide Applications (pdf, 12.8MB)