The route and rate of aerobic degradation of flutriafol was investigated in a laboratory study in six soils, using either [14C]-triazole or [14C]-carbinol labelled material. The rate of degradation was determined in 3 additional soils using unlabelled flutriafol. The studies were in general performed at 20°C and 40% MWHC. Very little degradation of flutriafol occurred during the incubation phase of up to 252 days. The maximum quantified level of two unidentified metabolites was 4% in total after 126 days incubation in two soils (from triazole-labelled compound). Mineralisation to CO2 was low, reaching up to 3.6% and 2.6% AR in a loamy sand soil for triazole and carbinol labelled flutriafol, respectively. The unextraced residues also were at low levels accounting up to 8.6% and 2.8% (loamy sand), for triazole and carbinol labelled flutriafol. However, the relatively harsh extraction methods (reflux, soxhlet) may somewhat overestimate the levels extracted compared to that which is available to soil organisms and plants (and may subsequently lead to an overestimate of the DT50 values calculated). At a lower soil moisture the degradation rate was slower and and the evolved CO2 and unextracted residues reached lower levels. The data from the nine soils were subjected by the Notifier to non-linear regression of first order kinetics using the Solver function within Microsoft Excel (2002). The DT50 values for flutriafol at 20°C and 40% MWHC and different application rates (corresponding to 100 - 1000 g a.s./ha) ranged from 672 to 3492 days (geometric mean of 1587 days and median 1820 days). However, since the figures were extrapolations far beyond the duration of the study (maximum 365 days) they are subject to considerable quantitative uncertainty.