Potato, Tomato, Brinjal and Bell Peppers are important vegetables with nutritional properties. These important vegetables are infected by various micro fungi, in the storage as well as in the market condition. The infection of the micro fungi on these important vegetables is responsible for decaying and there by the vegetable are becoming unhealthy and non consumable. This affect on the vegetables cause huge economic losses to the grower, whole sellers and the retailers. This investigation encompasses the major causes of postharvest losses in vegetables (Potato, Tomato, Brinjal and Bell Peppers) due to fungal pathogen. Postharvest diseases vary each year and a wide range of air spores like fungal spore, pollen, bacteria, insects, etc cause diseases. The spores of fungi which cause diseases of vegetables after harvest is called post harvest disease of vegetables. The most frequently present fungi are Phytophthora sp., Alternaria sp. Fusarium, etc