Activity of Florpyrauxifen-Benzyl on Fall Panicum (Panicum dichotomiflorum Michx.) and Nealley's Sprangletop (Leptochloa nealleyi Vasey)

A glasshouse study was established at Louisiana State University campus in Baton Rouge, LA, to evaluate the control of fall panicum and Nealley's sprangletop treated with florpyrauxifen-benzyl. Florpyrauxifen was applied at 30 g ai ha-1 to each grass species at the three- to four-leaf and oneto two-tiller stages of growth. At 21 d after treatment (DAT), fall panicum control was 91% when treated with florpyrauxifen at the three- to four-leaf stage, and Nealley's sprangletop control was 78% to 82%, regardless of application timing 21 DAT. Leaf number, tiller number, plant height, and plant fresh weight were reduced when fall panicum and Nealley's sprangletop were treated with florpyrauxifen. This information can be useful for developing weed management strategies with this herbicide for rice production, and it provides an additional mode of action to help manage and/or delay the development of herbicide-resistant weeds. Nomenclature: Florpyrauxifen-benzyl [benzyl-4-amino-3- chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)- 5-fluoropyridine-2-carboxylate]; fall panicum, Panicum dichotomiflorum Michx.; Nealley's sprangletop, Leptochloa nealleyi Vasey; rice, Oryza sativa L.