Fungicidal compounds of the general formula, or the corresponding pyridine N-oxide, wherein X, Y, R1, R2, R3, R4 and R5 are as defined in the description. Further, the spatial point recognition device is capable of moving the convergent point, such that the coordinates of the convergent point are superimposed onto the coordinates of the point light source, so as to achieve the purpose of tracking a spatial point automatically. coli type K99 infections using the said composition.