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
Corn and soybean exports continue to anchor weekly inspection totals, with China maintaining a visible role, while wheat and sorghum remain more dependent on regional and seasonal demand shifts.
Roger McEowen, with the Washburn School of Law, offers an in-depth look at two of the top legal issues of 202. Today, he walks through last year’s Waters of the United States (WOTUS) ruling and “lawfare.”
Lewis Williamson of HTS Commodities joined us with an update on the historic winter storm impacts and his outlook on today’s ag markets.
RFD NEWS correspondent Frank McCaffrey recently spoke with Dr. Mike Vickers, a South Texas rancher, who says illegal border crossings have dramatically declined in the last year.
New rule speeds leasing and permitting for federal oil and gas development
Year-round E15 remains on the table, but procedural caution and competing regional interests pushed action into a slower, negotiated path.
Without additional support, many soybean operations will continue to face financial stress as they prepare for the 2026 crop.
The National Cattlemen’s Beef Association and Public Lands Council published a joint press release regarding the advancement of legislation to delist the Mexican Gray Wolf from the Endangered Species Act.
Farm CPA Paul Neiffer joined us to break down the recent Fifth Circuit Court decision overturning a prior Tax Court decision on self-employment tax for limited partners, the ruling’s impact on farmers, and potential next steps in Congress.

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:

University of Nebraska–Lincoln (UNL) representative Dr. Dirac Twidwell joins us with the latest on woody encroachment conservation efforts in the Great Plains.
After years of battling misinformation online, Potatoes USA is using artificial intelligence to monitor and respond to false claims about the industry.
We highlight an Iowa FFA student who is harnessing the power of AI technology to assess stress in agriculture-related careers.
API said it stands ready to work with Congress to develop a balanced approach to E15 legislation that promotes fuel choice, supports investment certainty, and contributes to a stable and fair marketplace for American consumers.
Lawmakers are pressing for answers on how Washington’s “managed trade” approach — keeping leverage through long-term tariffs — will affect farmers, global markets, and future export opportunities.
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.