Uptake and dissipation of imidacloprid residues in okra

Uptake and dissipation of imidacloprid in okra was studied by treating  the seeds with Gaucho @ 9 g a.i./kg seed and spraying okra crop at the fruiting stage  with Confidor 200 SL at 0.3 and 0.6 ml/l. Imidacloprid was taken up by the plant from  its seed treatment and the residues persisted in plant for more than 30 days after  germination. However, residues could not be detected in fruits harvested at 50, 55 and  S  60 da s after germination. Imidacloprid residues dissipated exponentially with time  Y  following foliar application with a half-life of 2-4 days in two consecutive seasons. The  residues, however, became non-detectable l0 days after treatment at lower concentration  and 15 days after treatment at higher concentration.