Abstract: Objective To detect pesticide residues in Dendrobium candidum,and evaluate the cumulative risk of acute and chronic dietary intake,so as to provide technical support for safety supervision and local standard formulation. Methods A total of 81 local samples of Dendrobium candidum（dry products） were collected in 2021,and the residues of 5 fungicides and 2 pyrethroid insecticides in Dendrobium candidum were determined. The hazard index（HI） method was used to evaluate the cumulative risk of dietary intake of multiple pesticide residues in Dendrobium candidum. Results The detection rate of difenoconazole was the highest（98.77%）,followed by metalaxyl（91.36%）,propiconazole（77.78%）,prochloraz（58.02%） and pythil（12.20%）,while bifenthrin and cypermethrin were not detected. The total acute cumulative intake（aHI） of the five pesticides detected was 13.64×10^-3,and the total chronic cumulative intake（cHI） was 8.53×10^-3,all less than 1. Conclusion The acute and chronic cumulative dietary exposure risks of fungicide pesticide residues in Dendrobium candidum produced in Yunnan are low,but it is also suggested that the food regulatory authorities should further standardize the use and management of pesticides in Dendrobium candidum.

Key words: Dendrobium candidum, Pesticide residue, Cumulative exposure, Risk assessment