Degradation of the fungicide benthiavalicarb-isopropyl in soils

The degradation of benthiavalicarb-isopropyl (BVI) in soils was studied in the laboratory using two C-14-Compounds labeled at the benzene ring and the valine-moiety. The half-life of BVI in two kinds of soils (Ushiku soil and Kakegawa soil) was less than I I days, under both upland and flooded conditions. Five major degradation products, in addition to (CO2)-C-14, were identified. It is presumed that the degradation begins initially with hydrolytic cleavage of the amide bond, followed by several processes resulting in the final production of (CO2)-C-14. (c) Pesticide Science Society of Japan.