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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. The U.S. EPA is currently evaluating whether to seek renewal or modification of the federal registration of dicamba products registered for use on soybeans. If EPA decides to register dicamba use on soybeans again in 2021, OISC will ask the Indiana Pesticide Review Board (IPRB) to call a public meeting to collect and review relevant information before OISC makes any determination about the state registration of these products in Indiana in 2021. Please watch this space for details on the IPRB public meeting.

  2. 2020 Engenia, Xtendimax, Fexapan, and Tavium Application Quick Guide (pdf, 1.18MB)
  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)