EPA Proposes Temperature-Based Cutoffs For Dicamba Use

Farmers will need to closely monitor forecasts if the regulatory changes are implemented, as temperature cutoffs will replace fixed spray dates.

NASHVILLE, Tenn. (RFD-TV) — The Environmental Protection Agency (EPA) is shifting its approach to over-the-top (OTT) dicamba applications on dicamba-tolerant cotton and soybeans. Instead of calendar-based cutoffs, the agency has proposed a new system tied to temperature forecasts, requiring applicators to use data from the National Weather Service or NOAA.

The new labels move away from past state-imposed cutoff dates and instead rely on daily and next-day temperatures, according to Nicholas Brown with the North Carolina State Extension Service.

  • Applications are permitted when both forecasts remain below 75 degrees Fahrenheit, with 20 fluid ounces of volatility reducing agent (VRA) required.
  • Between 75-85 degrees, the VRA requirement doubles.
  • At 85–95 degrees, applicators must either reduce treated acreage by 40 percent or eliminate tank mix partners, still including a VRA.
  • Any forecast of 95 degrees or higher prohibits use altogether.

The EPA says the changes simplify compliance compared to the past 40-page labels, though state regulators caution that shifting from date cutoffs may complicate planning. If finalized, the new labels could apply for the 2026 growing season.

Tony’s Farm-Level Takeaway: Farmers will need to closely monitor forecasts, as temperature cutoffs replace fixed spray dates. Planning flexibility may be reduced during hot spells, making compliance more weather-dependent.
Related Stories
The Environmental Protection Agency confirms that new single-fluorinated pesticides are not PFAS and remain fully compliant with current safety standards.
Pressure on grain storage capacity and stronger export positioning are pushing more grain onto railroads, highways, and river systems as logistics become a key bottleneck this fall.
The Cotton-4 are pushing hard for new value chain investments. Still, many U.S. cotton producers face unsustainable losses, and weakened regional textile capacity threatens the survival of the Carolina “dirt-to-shirt” supply chain.
Tryston Beyrer, Crop Nutrition Lead at The Mosaic Company, examines planning trends as producers weigh corn and soybean plantings for 2026.
Despite the need for swift action, many ag lawmakers and industry groups argue that farm aid alone will likely not be sufficient to help farmers without improved trade relations with China.
Corn exports remain strong, while soybeans and wheat shift week to week on river conditions and global demand.

Tony St. James joined the RFD-TV talent team in August 2024, bringing a wealth of experience and a fresh perspective to RFD-TV and Rural Radio Channel 147 Sirius XM. In addition to his role as Market Specialist (collaborating with Scott “The Cow Guy” Shellady to provide radio and TV audiences with the latest updates on ag commodity markets), he hosts “Rural America Live” and serves as talent for trade shows.

LATEST STORIES BY THIS AUTHOR:

Ranchbot Monitoring Solutions provides remote water-monitoring technology to help ranchers manage livestock water more efficiently.
Jones Hamilton Company shares insights on herd health, efficiency, and innovation for cattle producers this year at NCBA CattleCon in Nashville.
Lewis Williamson with HTS Commodities discusses current farmer sentiment, trade considerations, and the market factors shaping the outlook for the upcoming planting season.
The phone call injected optimism into the soybean market, but actual Chinese buying and its timing will ultimately determine the extent of U.S. agricultural export benefits.
Regulatory uncertainty could slow the growth of fiber and grain hemp unless implementation is delayed.
University of Nebraska-Lincoln President Dr. Jeffrey Gold talks about heart health and preventive care for viewers in rural communities.
Agriculture Shows
Special 3-part series tells the story of the Claas family’s legacy, which changed agriculture forever.
From soil to harvest. Top Crop is an all-new series about four of the best farmers in the world—Dan Luepkes, of Oregan, Illinois; Cory Atley, of Cedarville, Ohio; Shelby Fite, of Jackson Center, Ohio; Russell Hedrick, of Hickory, North Carolina—reveals what it takes for them to make a profitable crop. It all starts with good soil, patience, and a strong planter setup.
Champions of Rural America is a half-hour dive into the legislative priorities for Rural America. Join us as we interview members of the Congressional Western Caucus to learn about efforts in Washington to preserve agriculture and tackles the most important topics in the ag industry on Champions of Rural America!
Featuring members of Congress, federal and state officials, ag and food leaders, farmers, and roundtable panelists for debates and discussions.