Study was carried out from Sptember 2015 to March 2016 at the Biological control laboratory of cantho University to evaluate the pathogenicity of fungus Geotrichum candidum on five kinds os citrus fruits. The fungus G. candidum was received from Department of Plant Protction, cultured on Potato Dextrose Agar (PDA) and sprayed on each fruit with 2ml of spore suspension 10⁷ spores/ml. Before inoculate, a haft fruit were damage by needles. Results showed that on hurt fruits, disease symptom, whole fruit rot and sporulation appearred arlier tham on withot hurt fruit of five citrus fruits.