Dissipation of Ethion and Chlorpyriphos Residues in/on Chilli (Capsicum Annum L.)

Dissipation of ethion (0.1%) and chlorpyriphos (0.05%) on chillies was studied by spraying the crop four times at fortnight interval starting from 45 days after transplanting. An initial deposit of 1.84 mg kg−1 of ethion and 0.67 mg kg−1 of chlorpyriphos, dissipated to 0.17 (90.8%) and 0.07 mg kg−1 (89.6%) by 30 days after fourth spray, respectively. Half-life (RL50) values of 9.4 and 9.9 days and the waiting periods (Ttol) of 17.6 and 21.2 days were calculated for ethion and chlorpyriphos, respectively. The residues in shade dried red chillies on 30th day after last spray were 1.29 and 0.62 mg kg−1, which dissipated to 0.35 and 0.02 mg kg−1, respectively, for ethion and chlorpyriphos on 90th day.