Persistence and effect of processing on reduction of spiromesifen residues in chilli pepper (Capsicum annum L.) and soil

Abstract

Residue dynamics of spiromesifen (Oberon 240 SC) in chilli fruits was studied using Ultra high performance liquid chromatography coupled with tandem mass spectrometer (UPLC-MS/MS). The initial deposits of spiromesifen in chilli fruits after application at 96 and 192 g ai ha-1, were found to be 0.62 and 1.20 g g-1, which reached below quantitation level after 21 and 27 days, respectively. Half-life of spiromesifen at single and double recommended dose were 3.65 and 3.19 days, respectively and the corresponding waiting period calculated was 0.74 and 4.49 days. The removal of spiromesifen residues using different simple decontamination 2 h after spraying and 3 days of spraying were 77.74 -88.18 % and 55.46 -71.00 % respectively. Processing factor due to sun drying in dry chilli fruits ranged from 2.12 to 1.33 during 0 to 15th day after application.