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n this paper, copper(II) citrate Cu3(C6H5O7)2 was successfully synthesized in water solvent. The factors for the synthesis are temperature and molar ratio of the studied reactants. The structural characteristics, properties, and composition of the elements were investigated and evaluated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). , combines energy dispersive X-ray (EDX) detector and UV-Vis molecular absorption spectroscopy. The yield of copper (II) citrate in the reaction is 82.46% with a molar ratio of CuSO4/C6H5Na3O7 of 1.5/1 at 70oC. In vitro test results showed that copper (II) citrate compound at a concentration of 1000 ppm inhibited the growth of mycelium Sclerotium rolfsii and Fusarium oxysporum with an effectiveness of 19-53% after 2 days of culture. Besides, this compound also strongly inhibits plant bacterial pathogens such as Xanthomonas axonopodis (causing soft rot disease on citrus), Ralstonia solanacearum (causing tomato wilt disease) and Clavibacter michiganensis subsp.ichiganensis (causing disease). Green wilt and rot on tomatoes). These results suggest that copper(II) citrate can be used as a promising fungicide/bactericide to control fungal and bacterial diseases in citrus and tomatoes.