FMC launches new Authority Edge herbicide

FMC officials say it delivers residual protection against waterhemp, Palmer amaranth, and other difficult-to-control grasses and broadleaf weeds.

FMC is launching Authority Edge herbicide, a new preplant and preemergence herbicide for the 2020 growing season. U.S. Environmental Protection Agency (EPA) registration has been granted for use in soybeans, sunflowers, and dry shelled peas, including chickpeas.

Authority Edge herbicide provides two effective sites of action to combat resistant weeds and help preserve the effectiveness of postemergence herbicide technologies, according to FMC officials. They say its optimized low-use-rate liquid formulation of a Group 14 herbicide with the newest Group 15 herbicide delivers long-lasting residual control of small-seeded broadleaf weeds and grasses.     

Authority Edge herbicide controls a wide spectrum of weeds including waterhemp, Palmer amaranth, pigweed, black nightshade, common lambsquarters, kochia, Russian thistle, morningglories, smartweed, foxtail, barnyardgrass, and fall panicum. The new herbicide is effective against ALS, triazine, HPPD, ESPS (glyphosate) and PPO herbicide-resistant weed biotypes, according to FMC officials.       

“In trials, Authority Edge herbicide has demonstrated better in-season control of driver weeds than competitive products. It is an excellent foundational herbicide,” said Godfrey Lue, FMC herbicide product manager, in an FMC news release. “The optimized ratio of sulfentrazone to pyroxasulfone in this proprietary herbicide premix offers very strong weed control performance with use rate flexibility to fit with other in-season residual programs growers are using today. In soybeans, Authority Edge herbicide may be followed by Anthem Maxx herbicide, early post, as part of a sequential residual strategy.”  

Residual Control

The long residual control of Authority Edge herbicide creates a wider window for timely postemergence control, according to FMC officials.

“Once pigweeds emerge, they can grow 1 to 3 inches in a day. Since all post herbicide programs recommend treatment before pigweeds reach 4 inches tall, a strong soil residual herbicide is essential to maintain maximum control as long as possible. Authority Edge herbicide provides unmatched residual weed control, which importantly helps reduce the selection pressure on post herbicide technologies,” said Nick Hustedde, FMC technical service manager, in an FMC news release.

FMC officials cite a couple university trials that evaluated the herbicide. In a 2019 Southern Illinois University soybean trial, Authority Edge herbicide provided 98% control of waterhemp, 42 days after a preemergence treatment, exceeding the length of other treatments, according to FMC officials. In a 2019 University of Tennessee trial in Jackson, Authority Edge herbicide provided 98% control of Palmer amaranth and 83% control of pitted morningglory 28 days after application, compared with just 71% and 72% control with a competitive standard herbicide, according to FMC officials.  

Available in a convenient low-use-rate and easy-to-use liquid formulation, Authority Edge herbicide is labeled for fall and spring preplant and preemergence applications, up to three days after planting. FMC has applied for and anticipates having Authority Edge herbicide available for tank-mixing with different products including XtendiMax with VaporGrip Technology, Engenia herbicide, Enlist One herbicide, and Enlist Duo herbicides.  

Authority Edge herbicide is part of the FMC Freedom Pass Program, which includes Application Innovations, Agronomic Rewards, Product Financing and Product Assurances, according to FMC officials. 

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