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Accepted manuscript

Impact of glyphosate, imazapic, and metsulfuron on bahiagrass, vaseygrass, and guineagrass control

Published online by Cambridge University Press:  27 August 2025

Courtney L. Darling
Affiliation:
Graduate Research Assistant, Department of Agronomy, Range Cattle Research and Education Center, University of Florida-Institute of Food and Agricultural Sciences, Ona, FL, USA
Temnotfo L. Mncube
Affiliation:
Postdoctoral Research Associate, Department of Agronomy, Range Cattle Research and Education Center, University of Florida-Institute of Food and Agricultural Sciences, Ona, FL, USA
Brent A. Sellers*
Affiliation:
Professor and Center Director, Department of Agronomy, Range Cattle Research and Education Center, University of Florida-Institute of Food and Agricultural Sciences, Ona, FL, USA
Jason A. Ferrell
Affiliation:
Professor and Director, Department of Agronomy, Center for Aquatic and Invasive Plants, University of Florida-Institute of Food and Agricultural Sciences, Gainesville, FL, USA
Dennis C. Odero
Affiliation:
Associate Professor, Department of Agronomy, Everglades Research and Education Center, University of Florida-Institute of Food and Agricultural Sciences, Belle Glade, FL, USA
Jose C. Dubeux
Affiliation:
Professor, Agronomy Department, North Florida Research and Education Center, University of Florida-Institute of Food and Agricultural Sciences, Marianna, FL, USA.
*
Author for correspondence: Brent A. Sellers, Professor and Center Director, University of Florida-IFAS Range Cattle Research and Education Center, Ona, FL 33865. (E-mail: sellersb@ufl.edu)
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Abstract

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Bahiagrass, guineagrass, and vaseygrass are dominant weeds in bermudagrass pastures. Chemical control of these weeds is difficult as some herbicides damage bermudagrass. The objectives of the study were to assess the effect of glyphosate and glyphosate mixes with imazapic and nicosulfuron + metsulfuron on bahiagrass control and to evaluate the effect of glyphosate and/or imazapic, nicosulfuron + metsulfuron on guineagrass and vaseygrass control under greenhouse conditions. Bahiagrass field trials were conducted in Citra and Ona, FL, in 2016 and 2018, respectively, while greenhouse experiments were conducted in Ona in 2017 and 2018. Glyphosate tank mixes reduced bahiagrass biomass in Ona, whereas at Citra, biomass reduction did not differ between treatments although visual estimates of control were lowest with glyphosate at 0.28 kg ae ha-1. Results from the greenhouse experiment showed that 0.38 and 0.50 kg ae ha-1 of glyphosate were needed to achieve 80% (ED80) control at 30 DAT, while 0.60 and 0.47 kg ae ha-1 were required to reduce 80% biomass of guineagrass and vaseygrass at 60 DAT, respectively. Vaseygrass needed lower imazapic rates (0.05 and 0.19 kg ae ha-1) for 80% (ED80) control (visual estimates) and biomass reduction, respectively, whereas guineagrass required higher doses (0.31 and 0.28 kg ae ha-1 for visual estimates of control and biomass reduction, respectively). Glyphosate at 0.56 kg ae ha-1, glyphosate plus imazapic, or nicosulfuron + metsulfuron reduced guineagrass biomass while imazapic only, glyphosate tank mixes, and nicosulfuron + metsulfuron resulted in the highest vaseygrass biomass reduction. Glyphosate and glyphosate tank mixes were consistent in controlling all grasses, yet imazapic was effective at higher rates for guineagrass.

Information

Type
Research Article
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - ND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Weed Science Society of America