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Aminopyralid and Clopyralid Absorption and Translocation in Canada Thistle (Cirsium arvense)

Published online by Cambridge University Press:  20 January 2017

Bekir Bukun ,
Todd A. Gaines ,
Scott J. Nissen ,
Philip Westra ,
Galen Brunk ,
Dale L. Shaner ,
Byron B. Sleugh  and
Vanelle F. Peterson
Bekir Bukun
Affiliation:
Plant Protection Department, Harran University, Sanliurfa, Turkey
Todd A. Gaines
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Scott J. Nissen*
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Philip Westra
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Galen Brunk
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Dale L. Shaner
Affiliation:
USDA-ARS Water Management Research Unit, Fort Collins, CO 80526
Byron B. Sleugh
Affiliation:
Dow AgroSciences LLC, Indianapolis, IN 46268
Vanelle F. Peterson
Affiliation:
Dow AgroSciences LLC, Indianapolis, IN 46268
*
Corresponding author's E-mail: scott.nissen@colostate.edu
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Abstract

Aminopyralid is a new auxinic herbicide that provides Canada thistle control at lower use rates than clopyralid. Studies were conducted to determine if differences in absorption, translocation, or metabolism account for aminopyralid's greater biological activity. Radiolabeled aminopyralid and clopyralid were applied to individual leaves of rosette-stage Canada thistle plants. Nonionic surfactant was used for the absorption studies because it provided higher aminopyralid absorption than methylated seed oil or crop oil concentrate. Clopyralid was absorbed very rapidly, reaching 72% 24 h after treatment (HAT) and remaining near or above 80% during a 192-h time course. During the same time period, aminopyralid absorption increased from 34 to 60%. Clopyralid translocation out of the treated leaf was significantly higher than aminopyralid, 39% compared with 17%, respectively, 192 HAT. More of applied clopyralid translocated to aboveground tissue 192 HAT (27%) than to roots (12%), whereas aminopyralid translocation was similar in aboveground tissue (10%) and roots (7%) 192 HAT. Neither aminopyralid nor clopyralid was metabolized 192 HAT. Although aminopyralid is effective at lower use rates than clopyralid, clopyralid absorption and translocation were higher in Canada thistle. These results suggest that aminopyralid's chemical structure may provide for greater biological activity at the target site than clopyralid.

Keywords

AminopyralidclopyralidCanada thistle, Cirsium arvense (L.) Scop. CIRARAuxinic herbicidesmetabolismherbicide physiology
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 57 , Issue 1 , February 2009 , pp. 10 - 15
Copyright
Copyright © Weed Science Society of America 

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