Studies on Dissipation Kinetics and risk Assessment of Imidacloprid Residues in Tarai Region of Uttarkhand

Abstract

Dissipation behavior of neonicotinoid insecticide, imidacloprid (Imidacel  17.8 SL), in okra fruit was studied following application at dose 20 g a.i. ha-1 at VRC G.B.P.U.A.T. Pantnagar Uttrakhand, India, showed a initial deposit of 1.027 mg kg-1 imidacloprid in okra fruit samples. The residue level in okra fruit dissipated to 33.008 % of initial deposition after one day and it further declined to 80.817% after 5 days of last spraying. The residues dissipated below detection limit within 7 days in okra fruits. The half life (_t½) of imidacloprid in okra fruits was estimated 2.094 days. The residue level went below MRL (0.7mg kg-1 for okra) within 3 days at the recommended dose.