State Dicamba Rule Updates

Dicamba Use Resumes in Arkansas After State Supreme Court Issues a Stay

Emily Unglesbee
By  Emily Unglesbee , DTN Staff Reporter
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The Arkansas Supreme Court issued an emergency stay of a Pulaski County judge's temporary restraining order on Arkansas' new dicamba rules, which means, for now, dicamba applications are permitted through June 30, with certain buffer requirements in place. (DTN file photo by Greg Horstmeier)

Editor's Note: This story is being updated from May 26, after judicial decisions in Arkansas have once again changed the legal status of dicamba herbicides in that state. DTN will continue to post updates as the situation evolves.


ROCKVILLE, Md. (DTN) -- Arkansas applicators are legally permitted to apply dicamba through June 30 again, although these dicamba rules are still facing litigation.

Here's an update on the situation in Arkansas, as well as the status of the Illinois and Indiana rules further restricting use of XtendiMax, Engenia and Tavium in 2021.


On June 7, 2021, the Arkansas Supreme Court issued a stay of a circuit court's temporary restraining order, which had temporarily reinstated the more restrictive 2020 dicamba rules halting spraying after May 25.

Now, the Arkansas State Plant Board's most recently adopted dicamba rules are once again in effect for the state's farmers and applicators. That includes:

-- A ban on spraying dicamba after June 30.

-- A one-mile buffer in place around university research stations and fields.

-- A half-mile buffer in place for specialty or organic crop fields.

-- A quarter-mile buffer in place for non-dicamba-tolerant crop fields.

-- No tank mixing glyphosate and dicamba.

-- No use of older, more volatile dicamba formulations.

This makes the third major change to dicamba rules in the state in the past six weeks. On May 4, the state's plant board voted to approve the new dicamba rules listed above. That marked a significant change from 2020 when Arkansas had the most restrictive state limitations on dicamba in the country.

But two lawsuits quickly upended the new rules. The first lawsuit, Glenn Hooks et al v. Arkansas State Plant Board, was brought by a group of farmers and environmentalists. The second, OMP Farms et al v. Arkansas State Plant Board, was brought by Ozark Mountain Poultry and a group called Freedom to Farm. Both lawsuits are challenging the newly passed dicamba rule.

On May 21, Judge Morgan Welch, of the 6th Division of the Pulaski County Circuit Court, issued a temporary restraining order to halt implementation of the new dicamba rules in response to the Hooks lawsuit. On May 24, that temporary restraining order was extended until June 10, when another hearing will be held, and the state's department of agriculture informed growers that until then, the 2020 dicamba rules, with their May 25 ban on spraying, were in place. (See DTN's previous story on that development here:….)

But on Monday, June 7, in response to an appeal of that temporary restraining order by the Arkansas attorney general's office, the state's Supreme Court issued an emergency stay, flipping the state back to the new dicamba rules.

See the Arkansas State Plant Board's legal notice confirming this change here:….


Two other states, Indiana and Illinois, will have dicamba cutoffs in 2021 that are more restrictive than the federal label. Last year, EPA announced states could no longer use Section 24(c) labels to further restrict the federal label, so those state regulators worked through different legal paths.

On March 2, the Indiana Pesticide Review Board (IPRB) voted unanimously to categorize all dicamba herbicides containing more than 6.5% dicamba as highly volatile herbicides. This will allow the state to establish a statewide permit for their use, which will ban spraying them after June 20. See a question and answer on these new rules from the Office of Indiana State Chemist here:….

In Illinois, the state's department of agriculture established an emergency administrative rule in February that will ban applications of XtendiMax, Engenia and Tavium after June 20. The rule also prohibits spraying dicamba when the temperature rises above 85 degrees Fahrenheit. See more on those restrictions here:….


Several states, including North Carolina, Oklahoma and Texas, attempted to expand the federal dicamba labels in 2021. They submitted Section 24(c) labels with extended spray cutoffs to EPA to accommodate double-planted soybeans and late-planted cotton acres.

However, so far, EPA has rebuffed those moves, arguing that permitting more expanded use of dicamba would be unsafe and open the agency up to legal liability. See more from DTN here:….

Remember that the federal labels released in October 2020 do differ in key ways from the 2018 labels. See a DTN breakdown of that here:….

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Emily Unglesbee