In laboratory soil studies conducted at temperatures of either 20 or 25°C, flurprimidol was slowly degraded in a wide range of soil types under aerobic conditions. Aerobic degradation of flurprimidol in soil did not lead to the formation of any major (i.e. 􀁴 10% of applied radioactivity) degradation products. At least four minor (< 10% of applied radioactivity) degradation products were observed and they accounted for a combined maximum total of 17.6 % of applied radioactivity at any one time. The most prominent individual degradation product observed comprised of 9.2 % of applied radioactivity after 60 days and subsequently declined. Degradation of flurprimidol under aerobic conditions proceeded via the minor degradation products and non-extracted soil residues to ultimately form carbon dioxide. The level of non-extracted residues observed from each soil type steadily increased throughout the study (180 days) in most soil types reaching maximum levels of 17.0 - 29.6% of applied radioactivity. Only in the peat soil the levels of non-extracted residues were observed to decline by the end of the study. The levels of carbon dioxide evolved increased steadily throughout the incubation period and, depending on soil type, comprised of maximum levels of 9.4 to 26.4% of applied radioactivity after 180 days.