Farmers, truckers and economists say a move to cut taxes on diesel will provide little relief from record-high fuel prices that have soared since the U.S. attacked Iran months ago.

Industry groups said they appreciate President Donald Trump’s executive order expanding the use of a diesel now reserved for off-road work, but farmers already have access to the fuel and many have already wrapped up harvest. Truckers will struggle to navigate differing state rules.

“In the context of diesel prices that are over two dollars more than they were last year, it just doesn’t come close to closing that wound,” said Matt Perdue, president of the North Dakota Farmers Union.