Dissipation kinetics and risk assessment of chlorantraniliprole andlambda-cyhalothrin in okra (Abelmoschus esculentus) and soil

A field experiment was conducted to elucidate the dissipation kinetics, persistence, and risk assessment of chlorantraniliprole and lambda-cyhalothrin applied as ready-mix insecticide in okra [Abelmoschus esculentus (L.) Moench] and associated soil in April 2023 at Chaudhary Charan Singh Haryana Agricultural University, Hisar, Haryana. A mix formulation of chlorantraniliprole (9.3%) + lambda-cyhalothrin (4.6%) was applied at the fruiting stage of okra (Hisar 102 variety) in different doses (28, 35 and 56 g a.i./ha). The samples were analysed using a validated QuEChERS extraction protocol followed by GC-MS/MS quantification. Both insecticides confirmed tofirst-order dissipation kinetics, with half-lives of 1.40–4.36 days in okra fruits. Residues declined below the MRL within six days after application, establishing safe pre-harvest intervals. Dietary and soil risk assessments, based on estimated daily intake and risk quotient indicated negligible human and ecological risk. These findings provide critical data for residue management, regulatory compliance, and suitability of chlorantraniliprole and lambda-cyhalothrin in okra cultivation.