Three aerobic degradation studies (one study with four EU soils, one study with two Japanese soils and one study with three German soils -one soil has been excluded from consideration due to unreliability of the results-) indicated that diethofencarb degrades rapidly to a number of minor metabolites (6-NO2-DFC, DPO, [DFCCOOH]), all of which did not exceed 4.7% AR), via nitration at the 6th position of the phenyl ring, oxidation at the isopropyl methyl group to the carbonyl group and subsequent cyclisation. Diethofencarb finally dissipated to CO2 (10.9-57.0% AR after 30-270 days) and non-extractable residues (28.2-82.6% AR after 62-270 days). Nonextractable residues could be fractionated to humic acid (7.7-22.1%), humin (5.3-58.6%) and fulvic acid (9.2- 23.0%). A number of other minor unidentified metabolites were detected, all of which did not exceed 3.5% AR.