Phenylpiperidinecarboxamide derivatives of the formula (I) in which the symbols R1, R2, R3 and R4 are each as defined in the description, and salts, metal complexes and N-oxides of the compounds of the formula (I), and the use thereof for controlling phytopathogenic harmful fungi and processes for preparing compounds of the formula (I).式(I)的苯基六氫吡啶羧醯胺衍生物其中符號R1、R2、R3和R4如說明中所定義,以及式(I)化合物的鹽、金屬錯化物和N-氧化物,其用於防治引起植物疾病之有害真菌的用途以及式(I)化合物的製備方法。