Alligator weed, Residues, Persistence, Dissipation, Alternanthera philoxeroides

Alligator weed is a serious problem of aquatic and low land areas in India. 2, 4-D, metsulfuronmethyl and glyphosate were evaluated at different doses to control terrestrial form of alligator weed. It was found that persistence of metsulfuron-methyl was directly dependent on application dose and persistence of herbicides increased with increased rate of application. 2, 4-D residues dissipated completely by 15 and 45 days from 0-15 and15-30 cm soil depth at 2.5 kg/ha. Glyphosate and metsulfuron-methyl persisted upto 45 and 60 days, respectively