Bioaccumulation and Metabolic Patterns of Seven Fungicides: a Comparison between Sclerotium rolfsii and Peanut Plants

This study focuses on the differences in bioaccumulation and metabolic patterns of seven fungicides between S. rolfsii and its host plant, peanut. The BCF value of the fungicides in S. rolfsii ranging from 0.62 to 2.39, was much lower than that in peanut roots, except for carboxin. Fluopyram exhibited an opposite xylem/phloem translocation ability compared to pyraclostrobin. A total of 19 metabolites were identified. In S. rolfsii, pyraclostrobin and benzovindiflupyr showed the highest metabolic rates. Peanut plants metabolized more than 99.87% of carboxin, while only 4.94% of carboxin was metabolized in S. rolfsii. The metabolic rates of other fungicides in peanut plants were not higher than 5.23%. Carboxin taken up by roots mainly exists in the entire plant as carboxin sulfoxide and oxycarboxin, while absorbed from leaves, oxycarboxin is the main metabolite in the roots and stems. This study would provide important clues for the application of pesticides and the creation of new pesticides.