Translator Disclaimer
1 September 2007 Mechanism of Antagonism of Mesotrione on Sulfonylurea Herbicides
Author Affiliations +
Abstract

Studies were conducted to determine if altered absorption, translocation, or metabolism were the basis for the reduction in sulfonylurea herbicide efficacy on foxtail species when mesotrione was mixed with a sulfonylurea herbicide. Green foxtail and yellow foxtail plants were grown in the greenhouse and treated at the four-leaf stage with 14C-labeled nicosulfuron or rimsulfuron, applied alone or with mesotrione or mesotrione atrazine. Absorption of nicosulfuron was greater in green foxtail and yellow foxtail 7 d after treatment (DAT) when applied alone, compared with absorption when mixing the herbicide with mesotrione or mesotrione atrazine. When nicosulfuron was applied alone, 9% more of the nicosulfuron in green foxtail was translocated at 7 DAT, as compared with when nicosulfuron was applied in combination with mesotrione or mesotrione atrazine. Translocation of nicosulfuron in yellow foxtail, however, was similar when nicosulfuron was applied alone or in combination with mesotrione or mesotrione atrazine. The addition of mixing rimsulfuron with mesotrione did not reduce the absorption of rimsulfuron in green foxtail 7 DAT, but the addition of mesotrione atrazine resulted in a 20% decrease in rimsulfuron absorption 7 DAT compared with absorption of rimsulfuron applied alone. Yellow foxtail absorption of rimsulfuron at 7 DAT was decreased by 11 or 20% when mixed with mesotrione or mesotrione atrazine, respectively. Application of rimsulfuron alone resulted in 6% more herbicide being translocated to the treated tiller in green foxtail at 7 DAT, compared with an application of mesotrione atrazine and rimsulfuron. Translocation of rimsulfuron in yellow foxtail was similar when applied alone or in combination with mesotrione or mesotrione atrazine. Nicosulfuron and rimsulfuron metabolism in foxtail species was similar when applied alone or in combination with mesotrione or mesotrione atrazine.

Nomenclature: Atrazine; mesotrione; nicosulfuron; rimsulfuron; green foxtail; Setaria viridis (L.) Beauv. SETVI; yellow foxtail; Setaria glauca (L.) Beauv. SETLU

Christopher L. Schuster, KASSIM AL-KHATIB, and J. Anita Dille "Mechanism of Antagonism of Mesotrione on Sulfonylurea Herbicides," Weed Science 55(5), 429-434, (1 September 2007). https://doi.org/10.1614/WS-06-217.1
Received: 24 December 2006; Accepted: 1 April 2007; Published: 1 September 2007
JOURNAL ARTICLE
6 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top