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Ohio State University Extension



EPA Annouces New changes to dicamba registration

The 9th Circuit Court of Appeals orders the U.S. Environmental Protection Agency (US EPA) to vacate the registration of three of the four dicamba products that had previously been approved for use on dicamba tolerant (DT) soybeans. Those products are: XtendiMax, Engenia, and FeXapan. Tavium is still registered for use in Ohio.

EPA Offers Clarity to Farmers in Light of Recent Court Vacatur of Dicamba Registrations
Peggy Hall Law Blog on EPA Clarification

The Ohio Department of Agriculture has requested guidance from the US EPA about what this ruling means to soybean producers and pesticide dealers in Ohio. 
Visit the ODA webpage for updates.

For more information on the ruling, visit Peggy Hall's Law Blog

Dr. Mark Loux, professor and weed science specialist at The Ohio State University, recaps the events of dicamba and offers guidance on how to adjust herbicide programs. Read more...

Anyone that applies Xtendimax, Engenia or Tavium in Ohio must:

  • Take the dicamba-specific training (see below)

  • Two-year registration (until December 20, 2020)
  • Only certified applicators may apply dicamba over the top (those working under the supervision of a certified applicator may no longer make applications) Get Exam Prep Here:
  • 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 over-the-top 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)
  • 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


Precautions for Dicamba Use in Xtend Soybeans (Purdue Extension Factsheet)

Recordkeeping Template

Xtendimax Application Requirements

Engenia Application Requirements

Tavium Appliation Requirements


Dicamba-Specific Training Information

Ohio accepts training sessions led by the product registrants (BASF, Bayer, Syngenta).  This includes webinars and online courses offered by the companies, as well as their in-person trainings.  Ohio will also accect training from IN, KY, MI, PA & WV.