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Influence of hard water on 2,4-D formulations for the control of dandelion

Published online by Cambridge University Press:  09 December 2020

Geoffrey P. Schortgen  and
Aaron J. Patton Open the ORCID record for Aaron J. Patton [Opens in a new window]
Geoffrey P. Schortgen
Affiliation:
Extension Educator, Agriculture & Natural Resources, Wabash County Extension, Purdue University, Wabash, IN, USA
Aaron J. Patton*
Affiliation:
Professor, Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, USA
*
Author for correspondence: A.J. Patton, Department of Horticulture and Landscape Architecture, Purdue University, 625 Agriculture Mall Drive, West Lafayette, IN47907 Email: [email protected]
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Abstract

The herbicide 2,4-D is used in a variety of cropping systems, especially in grasses because it is a selective postemergence broadleaf herbicide. However, the most common formulation (2,4-D dimethylamine) is antagonized when mixed in hard water. The objective of this research was to determine which formulations of 2,4-D or premixes of various formulations of synthetic auxin herbicides are subject to hard water antagonism. Formulations surveyed for hard water antagonism in the first experiment included 2,4-D dimethylamine, 2,4-D diethanolamine, 2,4-D monomethylamine, 2,4-D isopropylamine salt, 2,4-D choline salt, 2,4-D isooctyl ester, and 2,4-D ethylhexyl ester. Synthetic auxin formulation types in the second experiment included water-soluble, emulsifiable concentrates and emulsion-in-water. All formulations were mixed with both soft and hard water (600 mg CaCO3 L−1) and applied to dandelions to determine whether antagonism occurred in hard water. Water-soluble (amine and choline) 2,4-D formulations were antagonized by hard water, but water-insoluble (ester) 2,4-D formulations were not antagonized. Similar results were found by formulation type with water-soluble synthetic auxin premixes antagonized but emulsifiable concentrates not antagonized. Furthermore, water-soluble salt formulations were not antagonized when formulated in premixes with other synthetic auxin herbicides as an emulsion-in-water. This research demonstrates that all 2,4-D water-soluble formulations and water-soluble premixes with phenoxycarboxylic acid herbicides are subject to hard water antagonism. Formulations of 2,4-D containing emulsifying agents protect against antagonism by the water-insoluble nature of ingredients in their formulation.

Keywords

2,4-DdandelionTaraxacum officinale G.H. Weber ex WiggersMCPPMCPAamineantagonismemulsifiable concentrateemulsionesterhard waterwater-solublewater-insoluble
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 3 , June 2021 , pp. 371 - 379
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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: Patrick E. McCullough, University of Georgia

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