Abstract
A supervised field trial was conducted at Anand, Gujarat during 2015 to study the rate of degradation of imidacloprid in psyllium spikes following foliar application of imidacloprid formulation, Confidor 17.8 SL (soluble liquid) @ 25 (standard dose) and 50 (double dose) g a.i. ha−1. The Imidacloprid residues in psyllium spikes, herbage and soil samples were estimated on high performance liquid chromatograph. The method gave very good overall mean recoveries in the range of 80.37–102.58 %. The limit of detection and the limit of quantification were found to be 0.01 and 0.03 μg g−1, respectively. The initial deposits of 0.46 and 1.21 μg g−1 in psyllium spikes reached below determination level (BDL) of 0.03 μg g−1 on the 10th and 14th day at standard and double dose, respectively. The half life of imidacloprid in psyllium spikes ranged from 2.9 to 3.1 days. The residues in the soil and herbage samples collected at harvest were BDL (0.03 μg g−1) at either dose of application.
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