New Soybean Pre-Emergent Herbicide Targets Pigweeds

Waterhemp, Palmer amaranth, redroot pigweed—these words in agriculture are nearly synonymous with other unsavory four-letter words. Joining the fight against these foes is FMC’s Authority Edge pre-plant, pre-emergent herbicide for use in soybeans, sunflowers and dry shelled peas.

The product is a low-rate liquid formulation of group 14 and the newest group 15 herbicide. It provides residual control of small-seeded broadleaf and grass weeds. FMC says it’s labeled for use against waterhemp, Palmer amaranth, pigweed, black nightshade, common lambsquarters, Russian thistle, morning glories, smartweed, foxtail, barnyardgrass and fall panicum.

“The optimized ratio of sulfentrasone to pyroxasufone in this proprietary herbicide premix offers very strong weed control performance with use rate flexibility to fit with other in-season residual programs,” said Godfrey Lue, FMC herbicide product manager in a recent press release. “In trails, Authority Edge herbicide has demonstrated better in-season control of driver weeds than competitive products. It is an excellent foundational herbicide.”

In a 2019 Southern Illinois University soybean trial, Authority Edge provided 98% control of waterhemp 42 days after the pre-emergent treatment. A University of Tennessee trial showed 98% control of Palmer amaranth and 83% control of pitted morning glory 28 days after application. The herbicide can be used for fall and spring pre-plant and pre-emerge applications and up to three days after planting.

In addition, it’s a safe mix partner for XtendiMax, Engenia, Enlist One and Enlist Duo herbicides.

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