Residual Dissipation Pattern of Dichlorvos and Etofenprox in Squash under Greenhouse Condition

Dichlorvos and etofenprox as insecticides were widely used for crop protection, but the residues of the pesticides in the fruit and the leaf of squash were not studied well. In here, the residues dissipation and the biological half-lives were investigated in the fruit and the leaf of squash. The residues of dichlorvos in the leaf and fruit of squash were detected 0.916-1.111 mg kg and 0.016-0.025 mg kg on 0 day-aftertreatment (DAT) respectively, but no detection showed after 3 DAT both in the fruit and in the leaf. The etofenprox residues were 0.075-0.098 mg kg and 6.378-7.443 mg kg on 0 DAT in the fruit and the leaf, but the residue concentration in the fruit was below the temporal maximum residue limit (0.2 mg kg) regardless of the harvest date. The half-lives of etofenprox in the fruit and the leaf were 3.5 and 7.1 day, respectively. In addition, the dietary exposure risks of etofenprox were estimated to 0.018% and 0.027% of acceptable daily intake (ADI) for all age group from the fruit and the leaf. Furthermore, the %ADI for the infant group (1-2-year-old, 0.044% ADI) and the elder age group (65-year-old, 0.031% ADI) were higher than all the age groups from the dietary of the fruit.