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Effect of carrier volume and application method on waterhyacinth (Eichhornia crassipes) response to 2,4-D, glyphosate, and diquat

Published online by Cambridge University Press:  22 January 2021

Benjamin P. Sperry*
Affiliation:
Research Assistant Scientist, University of Florida, Center for Aquatic and Invasive Plants, Gainesville, FL, USA
Jason A. Ferrell
Affiliation:
Professor and Director, University of Florida, Center for Aquatic and Invasive Plants, Gainesville, FL, USA
*
Author for correspondence: Benjamin P. Sperry, University of Florida, Center for Aquatic and Invasive Plants, 7922 NW 71st Street, Gainesville, FL32653. (Email: [email protected])

Abstract

Mesocosm studies were conducted in 2020 to evaluate the effects of carrier volume and application method on waterhyacinth [Eichhornia crassipes (Mart.) Solms] response to 2,4-D, glyphosate, and diquat. Carrier volumes of 935, 467, and 187 L ha−1 were applied using either a conventional stream, conventional cone, adjustable cone, or a drizzle-stream spray pattern. Reducing carrier volume from 935 L ha−1 reduced spray coverage up to 60%, depending on application method. However, reducing carrier volume did not diminish efficacy of any herbicide or application method. Alternatively, E. crassipes control from 2,4-D increased 10% to 26% when applied using 187 L ha−1 compared with 935 L ha−1. Likewise, E. crassipes biomass was reduced 91% when 2,4-D was applied using 935 L ha−1; however, treatment applied at 187 L ha−1 resulted in 99% biomass reduction. In general, 2,4-D resulted in roughly 10% greater control when conventional or adjustable cone applications were used compared with either stream applications. Eichhornia crassipes control at 7 d after treatment (DAT) from diquat increased with decreasing carrier volumes; however, treatment effects in diquat experiments were not detected at other evaluation intervals. Glyphosate efficacy was highly influenced by carrier volume, as E. crassipes control increased up to 61% when applied using 187 L ha−1 compared with 935 L ha−1. Moreover, E. crassipes biomass reduction increased from 55% in the 935 L ha−1 treatment to 97% in the 187 L ha−1 treatments. Glyphosate application methods consisting of conventional stream or conventional cone sprayers resulted in slightly increased E. crassipes control by 28 DAT; however, no differences among application methods were observed in E. crassipes biomass data. These data support further evaluations of alternative application techniques for E. crassipes control under field conditions and for other herbicides and aquatic plant species.

Type
Research Article
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: Rob J. Richardson, North Carolina State University

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