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Absorption and translocation of florpyrauxifen-benzyl in ten aquatic plant species

Published online by Cambridge University Press:  09 June 2021

Erika J. Haug Open the ORCID record for Erika J. Haug [Opens in a new window] ,
Khalied A. Ahmed ,
Travis W. Gannon  and
Rob J. Richardson
Erika J. Haug*
Affiliation:
Research Scholar, North Carolina State University, Raleigh, NC, USA
Khalied A. Ahmed
Affiliation:
Research Chemist, North Carolina State University, Raleigh, NC, USA
Travis W. Gannon
Affiliation:
Associate Professor, North Carolina State University, Raleigh, NC, USA
Rob J. Richardson
Affiliation:
Professor, North Carolina State University, Raleigh, NC, USA
*
Author for correspondence: Erika J. Haug, North Carolina State University, 4401A Williams Hall, 101 Derieux Place, Raleigh, NC27695. (Email: ejhaug@ncsu.edu)
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Abstract

Additional active ingredients are needed for use in aquatic systems to respond to new threats or treatment scenarios, enhance selectivity, reduce use rates, and mitigate the risk of herbicide resistance. Florpyrauxifen-benzyl is a new synthetic auxin developed for use as an aquatic herbicide. A study was conducted at North Carolina State University in which 10 µg L−1 of 25% radiolabeled florpyrauxifen-benzyl was applied to the isolated shoot tissue of 10 different aquatic plant species to elucidate absorption and translocation patterns in these species. Extremely high levels of shoot absorption were observed for all species, and uptake was rapid. Highest shoot absorptions were observed for crested floatingheart [Nymphoides cristata (Roxb.) Kuntze] (A192 = 20 µg g−1), dioecious hydrilla [Hydrilla verticillata (L. f.) Royle] (A192 = 25.3 µg g−1), variable watermilfoil (Myriophyllum heterophyllum Michx.) (A192 = 40.1 µg g−1), and Eurasian watermilfoil (Myriophyllum spicatum L.) (A192 = 25.3 µg g−1). Evidence of translocation was observed in all rooted species tested, with the greatest translocation observed in N. cristata (1.28 µg g−1 at 192 h after treatment). The results of this study add to the growing body of knowledge surrounding the behavior of this newly registered herbicide within aquatic plants.

Keywords

Egeria densaEichhornia crassipesHydrilla verticillataMyriophyllum heterophyllumMyriophyllum sibiricumMyriophyllum spicatumNymphoides cristataProcellacorSalvinia molestaVallisneria americana
Type
Research Article
Information
Weed Science , Volume 69 , Issue 6 , November 2021 , pp. 624 - 630
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Vipan Kumar, Kansas State University

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