Persistence of Clodinafop in Soil, Wheat Crop and Phalaris Minor

Persistence of clodinafop propargyl (15 WP), an alternative herbicide for the control of isoproturon resistant Phalaris minor biotypes, was studied in soil and wheat crop (Triticum aestivum Linn.) following foliar application at 33 0ays after sowing. Clodinafop ester was rapidly transformed to clodinafop acid in soil and plant environment. The acid dissipated in field soil with a half-life of 3 days. Harvest time residues in wheat grain and straw were below detectable limits. Dissipation of clodinafop acid was more rapid in wheat as compared in Phalaris minor.