Relative Activity of Four Triclopyr Formulations

Triclopyr is a synthetic auxin herbicide currently available as a triethylamine salt, butoxyethyl ester, pyridinyloxyacetic acid, or choline salt. The formulation of a herbicide has the potential to impact its activity; therefore, the objective of this study was to determine the relative activity of...

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Bibliographic Details
Published in:Weed technology 2017-12, Vol.31 (6), p.928-934
Main Authors: Dias, José Luiz C. S, Banu, Afsari, Sperry, Benjamin P, Enloe, Stephen F, Ferrell, Jason A, Sellers, Brent A
Format: Article
Language:English
Subjects:
Bioassays
Choline
Cotton
Dose-response
ED50
Formulations
Herbicides
Leaves
Potassium
Salts
Soybeans
Studies
Tomatoes
Triclopyr
triclopyr butoxyethyl ester
triclopyr choline salt
triclopyr pyridinyloxyacetic acid
triclopyr triethylamine salt
Triethylamine
Volatility
WEED MANAGEMENT-TECHNIQUES
Weeds
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Summary:Triclopyr is a synthetic auxin herbicide currently available as a triethylamine salt, butoxyethyl ester, pyridinyloxyacetic acid, or choline salt. The formulation of a herbicide has the potential to impact its activity; therefore, the objective of this study was to determine the relative activity of these four triclopyr formulations. Greenhouse dose-response studies were conducted twice at the University of Florida in 2015. The four formulations were foliar applied at rates ranging from 17 to 1,121 g ae ha-1 to 2- to 3-leaf soybean, sunflower, tomato, and cotton. The amine salt formulation provided the lowest ED50 values in tomato and sunflower (22.87 and 60.39 g ha-1, respectively); whereas in soybean, amine and choline formulations provided the lowest ED50 values (22.56 and 20.95 g ha-1, respectively). No differences between formulations were observed in cotton. These data suggest that (1) the amine salt formulation of triclopyr might be more active than the others on tomato and sunflower, and (2) the amine and choline salt formulations might be more active than the others on soybean. Further work must be conducted to determine whether there are differences among these formulations under a range of field conditions and target species. In addition, other important management factors such as applicator safety, volatility potential, and cost should be considered when choosing the best formulated product to be applied. Nomenclature: Triclopyr; cotton, Gossypium hirsutum L.; soybean, Glycine max (L.) Merr.; sunflower, Helianthus annuus L.; tomato, Solanum lycopersicum L.
ISSN:0890-037X
1550-2740
DOI:10.1017/wet.2017.75