Effect of Acifluorfen on the Absorption, Translocation, and Metabolism of Chlorimuron in Certain Weeds

Abstract

Foliar absorption of14-chlorimuron at 6, 12, 24, and 48 h after application to common cocklebur was reduced when applied in combination with acifluorfen. A maximum reduction of 10% was observed at 48 h.14C translocation to meristematic tissue above the treated leaves also was reduced by acifluorfen in common cocklebur at 24 and 48 h after treatment. Absorption and translocation of14C-chlorimuron in sicklepod was not affected by acifluorfen. Thin layer chromatographic analysis of treated leaf extracts showed two metabolites in common cocklebur (Rfvalues of 0.0 and 0.42) and four metabolites in sicklepod (Rfvalues of 0.0, 0.16, 0.33, and 0.50). All metabolites were more polar than the parent compound (Rfvalue of 0.64). Addition of acifluorfen did not affect chlorimuron metabolism in common cocklebur but reduced metabolism in sicklepod. Absorption, translocation, and metabolism of acifluorfen in common cocklebur or sicklepod were not affected by the addition of chlorimuron.