Dissipation and decontamination studies of cyantraniliprole in cabbage and soil
Abstract
Dissipation and decontamination studies of cyantraniliprole (Benevia 10.26% OD) in cabbage and soil was carried out following spray of cyantraniliprole at fruit setting stage on cabbage crop grown in plots of 5 x5 m size at recommended (60 g a.i. ha-1) and double of recommended dose (120 g a.i. ha-1) by Central Insecticide Board (CIB). Samples of cabbage were processed using modified QuEChERS method and analyzed using HPLC with retention time of 15.351 minutes. Recovery experiments were performed on cabbage heads and soil sample fortified @ 0.05, 0.50 and 1.00 mg kg-1 and the recoveries obtained were in the range of 86.11 – 89.54% and 85.60 – 88.05% respectively. Initial deposit of cyantraniliprole residue in cabbage heads was 0.449 mg kg-1 and 0.576 mg kg-1 for single (T1) and double (T2) dose respectively. These residues dissipated following first order degradation kinetics with half- life of 1.91 and 2.29 days respectively and reached below limit of quantification (LOQ i.e. 0.05 mg kg-1) on 7th and 10th day for single (T1) and double (T2) dose respectively. Level of residues in soil were < LOQ for both single (T1) and double dose (T2) on 0 day of spray. Washing followed by boiling was found most effective (100%) in dislodging residues of cyantraniliprole than washing with 5% NaCl solution and washing alone.