Persistence and Leaching of Thiacloprid in Soil Under Field and/or Laboratory Conditions

Persistence and leaching of thiacloprid was studied under field condition following application @ 180 and 360 g ai ha⁻¹. Thiacloprid residues in plough layer persisted beyond 16 days, but no residues were detected after 22 days. The dissipation of residues followed first order kinetics with half-life 3.2–3.3 days. The column leaching studies in laboratory revealed that of the 1000 µg of applied thiacloprid, only 0.045% was recovered in ieachate and the major amount (88.3% of applied) remained in upper 15 cm soil layer. The immobility of thiacloprid in soil was further confirmed in field studies. In field soil, residues were detected only upto 15 cm depth and no residues were found at lower depths even a high rate of application.