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Relative activity comparison of aminocyclopyrachlor to pyridine carboxylic acid herbicides

Published online by Cambridge University Press:  09 December 2019

Benjamin P. Sperry Open the ORCID record for Benjamin P. Sperry [Opens in a new window] ,
José Luiz C. S. Dias ,
Candice M. Prince ,
Jason A. Ferrell  and
Brent A. Sellers
Benjamin P. Sperry
Affiliation:
Graduate Student, Agronomy Department, University of Florida, Gainesville, FL, USA
José Luiz C. S. Dias
Affiliation:
Graduate Student, Agronomy Department, University of Florida, Range Cattle Research and Education Center, Ona, FL, USA
Candice M. Prince
Affiliation:
Graduate Student, Environmental Horticulture Department, University of Florida, Gainesville, FL, USA
Jason A. Ferrell*
Affiliation:
Professor and Director, Agronomy Department, University of Florida, Center for Aquatic and Invasive Plants, Gainesville, FL, USA
Brent A. Sellers
Affiliation:
Professor, Agronomy Department, University of Florida, Range Cattle Research and Education Center, Ona, FL, USA
*
Author for correspondence: Jason A. Ferrell, Professor and Director, Center for Aquatic and Invasive Plants, 7922 NW 71 Street, Gainesville, FL32653. Email: [email protected]
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Abstract

The pyridine carboxylic acid (PCA) herbicide family can exhibit differential activity within and among plant species, despite molecular resemblances. Aminocyclopyrachlor (AMCP), a pyrimidine carboxylic acid, is a recently discovered compound with similar use patterns to those of the PCA family; however, relative activity among PCAs and AMCP is not well understood. Therefore, the objective of this study was to quantify relative activity among aminopyralid, picloram, clopyralid, triclopyr, and AMCP in canola, squash, and okra using dose-response whole-plant bioassays. Clopyralid was less active than all other herbicides in all species and did not fit dose-response models. Aminopyralid and picloram performed similarly in squash (ED50 = 21.1 and 23.3 g ae ha−1, respectively). Aminopyralid was 3.8 times and 1.7 times more active than picloram in canola (ED50 = 60.3 and 227.7 g ha−1, respectively) and okra (ED50 = 10.3 and 17.3 g ha−1, respectively). Triclopyr (ED50 = 37.3 g ha−1) was more active than AMCP (ED50 = 112.9 g ha−1) and picloram in canola. Aminocyclopyrachlor (ED50 = 6.6 g ha−1) and triclopyr (ED50 = 7.8 g ha−1) were more active in squash than aminopyralid and picloram. In okra, AMCP (ED50 = 14.6 g ha−1) and aminopyralid (ED50 = 10.3 g ha−1) performed similarly but were more active than triclopyr (ED50 = 88.2 g ha−1). Herbicidal activity among AMCP and PCAs was vastly different despite molecular similarities that could be due to variable target-site sensitivity among species.

Keywords

Dose-responsedifferential activitypyridine carboxylic acidstructure-activity relationshipaminocyclopyrachloraminopyralidclopyralidpicloramtriclopyrcanola, Brassica napus L.squash, Cucurbita pepo L.okra, Abelmoschus esculentus L.
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 3 , June 2020 , pp. 402 - 407
Copyright
© Weed Science Society of America, 2019

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Footnotes

Associate Editor: Mark VanGessel, University of Delaware

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