The present invention relates to N-cycloalkyl-thiocarboxamide or N-cycloalkyl-N-substituted carboximidamide derivatives of formula (I) wherein A and B represent a 5-membered heterocyclyl groups, T represents an oxygen, sulphur or amino derivatives, Z1 represents a cycloalkyl group and Z2 and Z3 represent various substituents, their process of preparation, their use as fungicide active agents, particularly in the form of fungicide compositions, and methods for the control of phytopathogenic fungi, notably of plants, using these compounds or compositions.