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7 October 2024 Rice cultivar tolerance to florpyrauxifen-benzyl spray-applied vs. coated on urea
Bodie L. Cotter, Jason K. Norsworthy, Thomas R. Butts, Trenton L. Roberts, Andy Mauromoustakos
Author Affiliations +
Abstract

Complaints regarding the sensitivity of rice to florpyrauxifen-benzyl and off-target movement of the herbicide occurred following its commercial launch in 2018 in the midsouthern United States. These two concerns encouraged the exploration of an alternative application method for florpyrauxifen-benzyl in rice. A field study was conducted in 2020 and 2021 to determine if coating florpyrauxifen-benzyl on urea would reduce negative impacts of the herbicide to rice. Five commercial rice lines were evaluated: ‘Diamond', ‘Titan', ‘RT7321 FP', ‘RT7521 FP’, and ‘XP753’. Florpyrauxifen-benzyl coated on urea at a 2× rate (60 g ai ha–1) reduced rice injury in one of five commercial rice lines in 2020 and four of five commercial rice lines in 2021, compared to spray applications at the same rate. In 2020, ‘RT7521 FP’ exhibited a 17-percentage point injury reduction when coating florpyrauxifen-benzyl on urea at a 2× rate vs. the same rate sprayed. In 2021, rice injury was reduced by 26, 10, and 27 percentage points in the commercial rice lines ‘Diamond’, ‘Titan’, and ‘XP753’, respectively, following coated urea vs. spray applications at 4 wk after treatment (WAT). ‘XP753’ exhibited reduced injury (15 percentage points) by coating florpyrauxifen-benzyl at a 1× rate (30 g ai ha–1) 4 WAT in 2021, and another, ‘Diamond’, had comparable groundcover to nontreated plots when florpyrauxifen-benzyl was coated on urea at a 1× rate rather than the reductions observed from the spray application at a 2× rate. Yield differences were a function of urea rate rather than application method, where in six out of ten instances greater rough rice grain yield occurred at the higher rate. Findings from this experiment indicate that coating florpyrauxifen-benzyl on urea can reduce the amount of injury observed, especially in areas of overlap where you would have a 2× rate.

Nomenclature: Florpyrauxifen-benzyl; rice; Oryza sativa L.

Bodie L. Cotter, Jason K. Norsworthy, Thomas R. Butts, Trenton L. Roberts, and Andy Mauromoustakos "Rice cultivar tolerance to florpyrauxifen-benzyl spray-applied vs. coated on urea," Weed Technology 38(1), 1-6, (7 October 2024). https://doi.org/10.1017/wet.2024.60
Received: 11 January 2024; Accepted: 9 July 2024; Published: 7 October 2024
KEYWORDS
Application method
application technology
herbicide-coated
injury
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