The EPA has granted a permanent sugar beet tolerance for acifluorfen, the diphenyl-ether herbicide marketed by UPL, ending a years-long cycle of Section 18 emergency exemptions that growers had to request annually before each season.

The decision converts what was a recurring, time-limited workaround into standing federal clearance. Under Section 18 of FIFRA, emergency exemptions require state lead agencies to petition EPA each year, demonstrating that a serious pest problem exists and that no registered alternative is available. Permanent tolerances remove that paperwork burden and give growers regulatory certainty when they plan weed control programs.

Acifluorfen is a post-emergence, PPO-inhibiting herbicide used against broadleaf weeds. For sugar beet growers — concentrated in the Red River Valley of Minnesota and North Dakota, Idaho, Michigan and other producing regions — broadleaf weed control has tightened as resistance to glyphosate and other chemistries spread across key growing areas. Loosestrife, kochia, pigweed and lambsquarters complexes have driven much of the demand for alternative modes of action.

What does the permanent tolerance change?

The practical shift is regulatory, not agronomic. Growers could already apply the product under emergency exemptions in states where petitions were approved. The permanent tolerance means:

• No annual state-by-state exemption petitions to EPA
• Full label directions and use patterns instead of exemption-specific restrictions
• Defined maximum residue limits that processors and exporters can rely on
• Clearer liability and label enforcement framework for applicators

For sugar processors, a permanent tolerance also simplifies residue compliance. Beets delivered to cooperatives such as American Crystal, Minn-Dak and Amalgamated Sugar move into a chain where tolerance status affects marketability. A standing EPA tolerance gives those cooperatives a stable reference point rather than a patchwork of yearly exemption terms.

Why it matters for margins

Weed control costs sit directly in the variable-cost column of a sugar beet budget, one of the highest per-acre input budgets among row crops. Herbicide-resistant weed escapes reduce tonnage and sugar content, compounding losses at a time when beet growers face the same input inflation as other row-crop producers. A reliable, fully registered tool can reduce reliance on cultivation and rescue treatments, both of which carry costs that scale with fuel and labor.

The move also signals how EPA handles resistance-driven chemistry gaps: repeated emergency use can mature into permanent registration once residue and environmental data support a tolerance. Input makers watching the Section 18 pathway will read this as evidence that sustained exemption history can anchor a full registration strategy.

UPL, which holds the registration, gains year-over-year market access in beet country without reapplying through the exemption process. Further label details, geographic use restrictions and application rates will govern how broadly growers can deploy the product across the 2025 season and beyond.