Evaluation of certain insecticides and acaricides against thrips and mites on capsicum and dissipation of spiromesifen 22.9sl

Polyhouse experiments evaluated some new insecticides and acaricides against thrips, Scirtothrips dorsalisHood and mitePolyphagotarsonemus latusBanks. The results revealed that of the seven insecticides, thrips population got significantly reduced with spinosad (0.06 thrips/leaf) followed by diafenthiuron (0.50 thrips/leaf) and thiamethoxam (1.30 thrips/leaf). Likewise against mite spiromesifen (0.06 mites/leaf) was significantly superior followed by diafenthiuron (2.21 mites/leaf), triazophos (3.68 mites/leaf). The leaf curl index (LCI) was also used in evaluating the efficacy in addition to population counts, which gave similar results. Also dissipation of spiromesifen was studied with residues quantified through regular sampling till the residues are below determination level (BDL) of 0.05 mg kg”1 following the validated QuEChERS method. The qualitative and quantitative analysis of spiromesifen performed on LC-MS/MS (PDA) revealed initial deposits of 1.61 mg kg−1 detected at 2 hr after last spray, which dissipated to BDL at 10th day after spray. The half life and safe waiting period for harvest was 2.09 and 10.00 days, respectively.