The present invention relates to pyrimidinium compounds of formula (I), to the stereoisomers, salts, tautomers and N-oxides thereof, their mixtures and to compositions comprising such compounds or mixtures. The invention also relates to methods and uses of these pyrimidinium compounds and of compositions thereof, for combating and controlling animal pests. Furthermore, the invention relates also to pesticidal methods of applying such substituted pyrimidinium compounds.The pyrimidinium compounds of the present invention are defined by the following general formula (I):wherein R1, R2and Het are defined as in the description.本發明係關於式(I)之嘧啶鎓化合物、其立體異構體、鹽、互變異構體及N-氧化物、其混合物及包含此類化合物或混合物之組合物。本發明亦關於此等嘧啶鎓化合物及其組合物用於對抗及控制動物有害生物之方法及用途。此外，本發明亦關於施用此類經取代之嘧啶鎓化合物的殺有害生物方法。本發明之嘧啶鎓化合物係由以下通式(I)所定義：其中R1、R2及Het係如本說明書中所定義。
