Postharvest handling of citrus fruits has increased the concern over its losses caused by disease after harvest and storage. Citrus is susceptible to more than 150 diseases caused by fungal, viral and a few bacterial pathogens resulting in considerable yield losses. Only about half a dozen diseases threatened in postharvest handling. Among them, sour rot, green mould, blue mould, Diplodia, Phomopsis and Alternaria stem-end rots are important diseases which have been noticed more frequently throughout the world in recent years. This chapter describes symptoms, diagnostic tools and integrated management of postharvest diseases of citrus.