In a previous publication, the authors reported on the residue behavior and conversion of the insecticide kelevan C14 in potatoes and in the soil after application of the insecticide on leaves or on the soil. After the harvest, the potato foliage and the soil were demonstrated to contain radioactive residues which mainly consisted of metabolites of kelevan C14. This report describes the isolation and identification of these metabolites as well as the radioactivity balance at the end of the first period of vegetation after application of the insecticide on leaves. It was found that over 90% of kelevan is already converted during the first period of vegetation after application. All main decomposition products, however, are compounds with a shortened or eliminated side chain. So far, no modification of the carbon frame could be demonstrated.