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Tolerance of rhizoma perennial peanut to glyphosate and triclopyr

Published online by Cambridge University Press:  06 November 2020

Logan J. Martin ,
Brent A. Sellers Open the ORCID record for Brent A. Sellers [Opens in a new window] ,
Pratap Devkota Open the ORCID record for Pratap Devkota [Opens in a new window] ,
Jason A. Ferrell ,
Ramon G. Leon Open the ORCID record for Ramon G. Leon [Opens in a new window]  and
João M.B. Vendramini Open the ORCID record for João M.B. Vendramini [Opens in a new window]
Logan J. Martin
Affiliation:
Former Graduate Research Assistant, University of Florida-Institute of Food and Agricultural Sciences, Department of Agronomy, Range Cattle Research and Education Center, Ona, FL, USA
Brent A. Sellers*
Affiliation:
Professor, University of Florida–Institute of Food and Agricultural Sciences, Department of Agronomy, Range Cattle Research and Education Center, Ona, FL, USA
Pratap Devkota
Affiliation:
Assistant Professor, University of Florida–Institute of Food and Agricultural Sciences, West Florida Research and Education Center, Department of Agronomy, Jay, FL, USA
Jason A. Ferrell
Affiliation:
Professor and Director, University of Florida–Institute of Food and Agricultural Sciences, Center for Aquatic and Invasive Plants, Department of Agronomy, Gainesville, FL, USA
Ramon G. Leon
Affiliation:
Associate Professor, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
João M.B. Vendramini
Affiliation:
Professor, University of Florida–Institute of Food and Agricultural Sciences, Department of Agronomy, Range Cattle Research and Education Center, Ona, FL, USA
*
Author for correspondence: Brent A. Sellers, Professor and Director, Range Cattle Research and Education Center, 3401 Experiment Station, Ona, FL33865 Email: sellersb@ufl.edu
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Abstract

Rhizoma perennial peanut (RPP) is well adapted to the Gulf Coast region of the United States, but its varietal tolerance to glyphosate and triclopyr is not well defined. The research was conducted to determine the effect of various rates of glyphosate and triclopyr on established RPP, and the response of common RPP varieties to these herbicides. The RPP sward was approximately 7 yr younger at Zolfo Springs than at the Ona location. RPP showed moderate tolerance to glyphosate and triclopyr application, and injury level did not differ with the age of RPP sward. However, biomass production was negatively influenced by the age of the RPP sward. Overall, injury from glyphosate applications did not exceed 40% at either site. The glyphosate rate for 20% biomass reduction was predicted to be 0.53 and 2.17 kg ae ha−1 at Zolfo Springs and Ona, respectively. RPP injury from triclopyr was greater at the Zolfo Springs location than at Ona, and the triclopyr rate predicted to result in a 20% biomass reduction was 0.45 and 0.99 kg ae ha−1 at the Zolfo Springs and Ona locations, respectively. There was a difference on RPP varieties response to glyphosate and triclopyr application. ‘Florigraze’ and ‘Ona 33’ were less tolerant to glyphosate compared to ‘UF-Tito’ and ‘Ecoturf’ at 30 d after treatment. Likewise, UF-Tito and Florigraze were less tolerant to triclopyr compared to Ona 33 and Ecoturf. Overall, Florigraze showed highest injury and at least 2-fold reduction on biomass compared to the other three varieties from glyphosate or triclopyr application. Results from this research indicate that glyphosate and triclopyr appear to be safe to apply to long-established RPP stands, but herbicide rate and RPP varieties should be considered if stands are <5 yr old.

Keywords

Glyphosatetriclopyrrhizoma perennial peanutArachis glabrata BenthForage cropherbicide injuryperennial peanut varieties
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 4 , August 2021 , pp. 525 - 531
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Mark VanGessel, University of Delaware

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