Abstract：Nano pesticides have the advantages of small particle size, good dispersibility, and high utilization rate, making them a hot topic in the research of development of pesticide formulations in recent
years. In this work, a liquid chromatography-mass spectrometry method was established to analyze the retention dose of pyraclostrobin and tebuconazole on pepper leaves. The recovery rates were83.9%~
108.5%，and the relative standard deviation was 4.3% ~9.9%. The relention performance of 30% pyraclostrobin·tebuconazole nanosuspension on pepper leaves studied by foliar spray, with 30% pyra-
clostrobin tebuconazole suspension as control. The results showed that after 3 and 7 days of treatment, the pesticide retention on the pepper leaves treated with the control group was 0.042 ~2.71 mg/kg,which was lower than that of the nanosuspension treatment(0.064 ~4.93mg/kg).Nanosuspension had better retention performance on pepper leaves.
2024, Vol. 37 
