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 (T_tol) of 17.6 and 21.2 days were calculated for ethion and chlorpyriphos, respectively. The residues in shade dried red chillies on 30^th 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 90^th day.