Semester of Graduation
Spring 2025
Degree
Master of Science (MS)
Department
School of Plant, Environmental, and Soil Sciences
Document Type
Thesis
Abstract
A field study was conducted in 2023 and 2024 at the LSU AgCenter H. Rouse Caffey Rice Research Station (RRS) near Crowley, LA, and Northeast Research Station (NERS) near St. Joseph, LA, to evaluate tetflupyrolimet rates on medium and clay soils to find the optimum usage rates. The mixtures of tetflupyrolimet and clomazone controlled barnyardgrass at higher levels on a Crowley silt loam than when tetflupyrolimet and clomazone were applied alone. Barnyardgrass in both locations and broadleaf signalgrass control on a Crowley silt loam demonstrated no benefit in increasing the usage rate of tetflupyrolimet from 125 g ha-1 to 150 g ha-1 on a Crowley silt loam or 225 g ha-1 to 250 g ha-1 in St. Joseph. The three highest rate mixtures of tetflupyrolimet and clomazone controlled all weeds evaluated 85-94% across all rating dates.
A field study was conducted at RRS in 2023 and 2024 to evaluate tetflupyrolimet mixed with other herbicides to broaden the control spectrum. Clomazone-containing applications injured rice 21 DAT but not 35 DAT. Tetflupyrolimet applications did not injure rice at any rating interval. An antagonistic interaction occurred when quinclorac was mixed with tetflupyrolimet for barnyardgrass control at 21 DAT and for broadleaf signalgrass control at 21 and 35 DAT when observed control was 94-99%. Saflufenacil mixed with clomazone resulted in plots having lower yields, but this mixture only resulted in an antagonistic interaction for broadleaf signalgrass control 35 DAT.
A field study was conducted in 2023 and 2024 at RRS to compare tetflupyrolimet applied as a broadcast spray versus surface-coated fertilizer. No rate of tetflupyrolimet caused any injury to rice. Clomazone applied at 313 g ha-1 by fertilizer caused 5-15% more rice injury than any other treatment but provided 84 to 90% weed control. Surface-coated mixtures of tetflupyrolimet and clomazone at 90 and 125 g ha-1, respectively, and 125 and 313 g ha-1, respectively, resulted in no differences in injury, broadleaf signalgrass control, rice heights at maturity, or rough rice yields. Rough rice yields were higher following the broadcast spray herbicide applications due to less rice injury, higher levels of weed control, and uniform coverage.
Date
4-2-2025
Recommended Citation
Hains, Maranda A., "Evaluation of Tetflupyrolimet in Louisiana Rice Production" (2025). LSU Master's Theses. 6124.
https://repository.lsu.edu/gradschool_theses/6124
Committee Chair
Webster, L. Connor