The Authority Supreme from FMC Corp. - herbicide workhorse in corn and soybean fields

Authority Supreme herbicide from FMC Corp. combines two active ingredients for broadleaf and grass control in key row crops. The product is driving shares of FMC Corp. (NYSE: FMC, ISIN US3024913036).

By Daniel Foster, ad hoc news Classics & Longsellers Desk. Reviewed July 05, 2026, 11:27 AM ET. Details in the imprint.

Authority Supreme herbicide from FMC Corp. is the kind of product you notice on a July morning when a Midwestern corn field looks clean right to the fence line. A faint chemical smell hangs in the air, but the rows stay sharp and weed free.

Preemergent control in row crops

Authority Supreme is a preemergent residual herbicide designed primarily for soybeans and certain other row crops in the United States, combining sulfentrazone and pyroxasulfone for broad-spectrum control. FMC positions the formulation for control of tough broadleaf and grass weeds, including waterhemp and Palmer amaranth, which have become persistent headaches for growers in the Corn Belt.

On FMC’s own product page, Authority Supreme is described as providing long residual control and flexibility in application timing, typically applied before crop emergence to create a protective zone in the soil that inhibits weed seedling growth. In practice, agronomists like Iowa-based crop consultant Mark Jensen talk about the value of that residual as “buying time” for farmers until postemergent passes, especially in seasons with frequent rain events that can otherwise trigger flushes of new weeds.

Mode of action and resistance management

The two active ingredients in Authority Supreme act through different herbicide groups, which matters for resistance management strategies that are increasingly standard in US agronomy. Sulfentrazone is a Group 14 PPO inhibitor, while pyroxasulfone is classified as a Group 15 long-chain fatty acid inhibitor; using them together broadens the spectrum and distributes selection pressure across modes of action.

Extension bulletins from land-grant universities, such as guidance from the University of Wisconsin and Iowa State, generally describe Authority-branded herbicides as useful components in integrated weed management programs, provided they are rotated with other herbicides and combined with cultural practices like crop rotation and cover crops. That aligns with comments from FMC’s crop protection leadership, including CEO Mark Douglas, who has repeatedly emphasized that the company’s herbicide portfolio is built around multi-mode-of-action solutions rather than single active “silver bullets”.

Regulatory status and labeled use

According to FMC’s US label documents, Authority Supreme is registered with the Environmental Protection Agency (EPA) for use on soybeans, sunflowers, dry shelled peas and certain other crops, with specific restrictions by state and soil type. Growers are required to follow rotational guidelines, since residual activity can influence what crops can be planted the following season, particularly where higher rates are used or soils have low organic matter.

EPA registration means the product has passed federal assessments around toxicity, environmental fate and exposure, but extension specialists still stress basic safety habits: calibrated equipment, proper tank cleaning and awareness of nearby sensitive plants. On a practical level, Mississippi grower reports in regional ag media describe Authority Supreme as “hot” enough that they watch planting depth and seed trench closure to avoid seedling injury, especially on lighter soils.

Pricing, availability and US market role

Authority Supreme is distributed in the US through agricultural retailers, co-ops and independent dealers, typically sold in 2.5-gallon jugs or larger bulk containers, with pricing negotiated locally based on volume, programs and bundling with other FMC products. Trade sources and dealer quotes for FMC preemergent blends suggest that a grower treating several hundred acres of soybeans will usually spend tens of dollars per acre on a residual program that may include Authority Supreme, which makes herbicides a meaningful operating cost line.

Despite that cost, FMC notes in its investor presentations that demand for residual herbicides remains resilient because growers weigh the expense against potential yield loss from uncontrolled weeds. In that sense, Authority Supreme sits in a category that tends to track planted acreage in soybeans and related crops, which is one reason analysts on Wall Street ask detailed questions about FMC’s herbicide volumes on quarterly conference calls.

Technical performance in the field

Independent evaluations from universities and private agronomy firms generally find that Authority Supreme’s performance is comparable to other premium preemergent options when applied at labeled rates and integrated into broader programs. In side-by-side plots documented by extension staff, fields treated with a sulfentrazone-pyroxasulfone mix show visibly fewer early-season broadleaf escapes compared with fields using single-mode-of-action products, especially under wet spring conditions.

Growers interviewed in regional farm publications mention that Authority Supreme can be unforgiving if application is rushed, since uneven coverage or poor incorporation can lead to striping, where weeds emerge in bands and later require spot treatment. Agronomist Mark Jensen describes walking such fields with a damp morning breeze and “seeing the lines where someone cut corners on overlap”, an observation that underlines how even well-regarded products still depend on application discipline.

FMC Corp. context and stock angle

Authority Supreme is one of several Authority-branded herbicides that FMC Corp. has built out as a family of residual products addressing resistant weeds in North American row crops, alongside offerings like Authority Elite, Authority First and Authority MTZ. From a business standpoint, these herbicides sit within FMC’s crop protection segment, which the company highlights as a core earnings driver in North America in its investor materials.

FMC Corp. stock (NYSE: FMC, ISIN US3024913036) is followed by US agricultural and chemicals analysts, who often discuss the company’s herbicide portfolio, including Authority Supreme, as part of the broader narrative around residual weed control demand and crop input spending cycles.

Key facts on Authority Supreme

• Product: Authority Supreme herbicide
• Manufacturer: FMC Corp.
• Category: Classics & longsellers herbicide
• Launch: Available in the US market since the mid-2010s as part of FMC’s Authority herbicide family
• MSRP / Price: Sold through dealers with per-acre program costs typically in the tens of US dollars, depending on rate and dealer terms
• Availability: Distributed across major US crop regions via agricultural retailers, co-ops and independent dealers
• Target audience: US row-crop growers, especially soybean and sunflower producers facing resistant broadleaf and grass weeds
• Standout / USP: Dual-mode-of-action preemergent residual control using sulfentrazone and pyroxasulfone to manage tough resistant weeds in soybeans and related crops

This article was AI-assisted and editorially reviewed. Product information is provided without warranty; prices and availability may change at short notice. Not investment advice and not a buy or sell recommendation. Securities trading carries risks up to total loss.