Monitoring Degradation of Dicarboximidic Fungicide Residues in Soils

Iprodione, procymidone, and vinclozolin are dicarboximidic fungicides commonly used in preharvest viticulture treatments to prevent gray mold ( Botrytis ) and other fungal diseases. The aim of this study is to determine the degradation of these fungicides in five vineyard soils of Penedès after three treatments at 100-day intervals with commercial formulations under laboratory conditions. The analyses were conducted over a period beginning the same day of each treatment and lasting for up to 77 days afterward. In these conditions, the degradation rates of all three fungicides increased with the number of applications. Times elapsed to 90% degradation of iprodione, procymidone, and vinclozolin following first, second, and third treatments were about 35, 21, and 7 days, respectively. No residues were found at 77 days. These results showed that the residual levels of these three fungicides in soils decreased with time.