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Broadleaf weed control and white clover response to florpyrauxifen-benzyl + 2,4-D and common pasture herbicides

Published online by Cambridge University Press:  14 October 2022

Wykle C. Greene Open the ORCID record for Wykle C. Greene [Opens in a new window] ,
Scott Hagood ,
Benjamin Tracy Open the ORCID record for Benjamin Tracy [Opens in a new window] ,
Ozzie Abaye Open the ORCID record for Ozzie Abaye [Opens in a new window]  and
Michael L. Flessner Open the ORCID record for Michael L. Flessner [Opens in a new window]
Wykle C. Greene*
Affiliation:
Graduate Research Assistant, Virginia Tech, Blacksburg, VA, USA
Scott Hagood
Affiliation:
Professor Emeritus, Virginia Tech, Blacksburg, VA, USA
Benjamin Tracy
Affiliation:
Professor, Virginia Tech, Blacksburg, VA, USA
Ozzie Abaye
Affiliation:
Professor, Virginia Tech, Blacksburg, VA, USA
Michael L. Flessner
Affiliation:
Associate Professor, Virginia Tech, Blacksburg, VA, USA
*
Author for correspondence: Wykle Greene, Graduate Research Assistant, Virginia Tech, 675 Old Glade Road, Blacksburg, VA 24061. Email: wykle.greene@syngenta.com
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Abstract

The combination of florpyrauxifen-benzyl + 2,4-D is a new, pre-packaged herbicide mixture for use in pastures and hayfields in the United States. Unlike many other pasture herbicides, florpyrauxifen-benzyl + 2,4-D is reported to preserve white clover. However, limited research exists on the efficacy of florpyrauxifen-benzyl + 2,4-D on common weed species and on the level of tolerance of white clover to it. Field trials were conducted in Virginia in 2018 to 2020 to evaluate control of various broadleaf weeds with florpyrauxifen-benzyl + 2,4-D compared to other commonly used herbicides. Field and greenhouse studies were also carried out to assess white clover tolerance. Weed species evaluated included bulbous buttercup, Canada thistle, horsenettle, and broadleaf plantain. Florpyrauxifen-benzyl + 2,4-D provided 75% to 99% control of all weeds 90 d after application except for horsenettle (56%), while causing the least white clover injury of any herbicide treatment that was evaluated. Spring herbicide applications resulted in greater bulbous buttercup control compared to fall applications, but florpyrauxifen-benzyl + 2,4-D provided greater than 81% control from both application timings. There were no differences in aboveground biomass between white clover varieties; however, all herbicides reduced white clover biomass compared to a nontreated control. This research suggests that florpyrauxifen-benzyl + 2,4-D can improve overall forage quality by controlling broadleaf weeds in mixed grass-legume stands while preserving white clover.

Keywords

hayfieldsapplication timinglegumes24-Dflorpyrauxifen-benzylbroadleaf plantain, Plantago major L.bulbous buttercup, Ranunculus bulbosus L.Canada thistle, Cirsium arvense L.horsenettle, Solanum carolinense L.white clover, Trifolium repens L.
Type
Research Article
Information
Weed Technology , Volume 36 , Issue 5 , October 2022 , pp. 708 - 715
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Kevin Bradley, University of Missouri

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