Persistence of Endosulfan and Profenophos in/on Brinjal

Field experiment was conducted during 2007–08 at Fertilizer Research Station, Uttaripura, C.S.A.U.A. & T. Kanpur to study the persistence of endosulfan (35 E C) @ 350 and 700 g a.i. ha⁻¹ and profenophos (50EC) @ 800 and 1600 g a.i.ha⁻¹ on brinjal crop with two spraying. The initial deposits were 2.15 and 2.81 mg kg⁻¹ with 350 g and 700 ga.i. ha⁻¹ doses of endosulfan which dissipated with the time 96 and 94% on 15^th day. Initial deposits of profenophos residues were 3.89 and 4.25 mg kg⁻¹ at 800 and 1600 g a.i. ha⁻¹. Almost 91% residues of profenophos was dissipated on 15^th day. The half life values for endosulfan and profenophos were 3.17 and 3.96 days and 4.56 and 5.22 days, respectively. Waiting period for endosulfan and profenophos were 1 and 1.18 and 6.22 and 7 days at lower and higher doses of insecticides, respectively.