Persistence and dissipation kinetics of chlorantraniliprole in okra and soil

Persistence and dissipation pattern of chlorantraniliprole, an anthranilic diamide insecticide, is reported in okra and soil following application at 25 (recommended) and 50 g a.i. ha⁻¹. High performance liquid chromatograph (HPLC) was used to estimate the residues. The average initial deposits of chlorantraniliprole in okra were 0.21 and 0.46 mg kg⁻¹ at 25 and 50 g a.i. ha⁻¹, respectively. At the recommended dose, the initial residues were below the MRL (0.3 mg kg⁻¹) in okra fruits. The residues dissipated to below the limit of quantification (LOQ) of 0.03 mg kg⁻¹ after 7 and 10 d of the application of insecticide at the two doses respectively. The residues in soil were below the LOQ after 15 d of spray at the recommended dosage. The half-lives (t_1/2) and waiting periods of chlorantraniliprole in okra were calculated to be 2.27 and 2.45 d and 0 and 1 d, at the recommended and double the recommended dosages respectively.