Persistence of Diafenthiuron in Cardamom

Three application of diafenthiuron at normal (600 g ai ha⁻¹) and double the normal dose (1200 g ai ha⁻¹) were made at 21 days interval during 2 season field trials. The initial deposits were 3.00 μg g⁻¹ and 4.16 μg g⁻¹, the half-life was 1.7 and 2.9 days and the waiting period was 7 and 11 days in green capsule at normal and double the normal dose, respectively. In green capsule, the residues dissipated to below detectable limit (BDL) on 15^th day of application and in cured capsule BDL on 7^th day of application at normal dose. Curing of green cardamom resulted in faster degradation of the compound.