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1. Symptoms: Tomato umbilical rot originates in the umbilicus of young fruit and is initially stained with dark brown spots. As the fruit grows, the lesion gradually expands into a sub-set, leathery, brown, or black necrotic area, when wet The lesion was rotted with black mould. The hard brown area can be extended to the inside of the fruit, causing early redness of the diseased fruit and is an atypical physiological disease. 2. The cause of the disease is that the disease occurs because of calcium deficiency in the fruit. It is the insufficient supply of calcium in the corresponding functional leaves that supply fruit nutrition. There are several factors that affect the absorption of calcium from the soil by plants, including drought, and high salt concentrations. And the roots of plants are damaged by pests or excessive water. The excessive application of nitrogenous Fertilizer contributes to the occurrence of this disease, because nitrogen stimulates plant growth and consumes useful calcium for the fruit. Different types of species are more likely to infect the disease. 3. Prevention and control measures In order to effectively prevent the occurrence of umbilical rot, the following measures should be taken: First, pay attention to scientific balanced fertilization, in addition to full use of organic fertilizer as a base fertilizer, but also use a certain amount of superphosphate to prevent soil calcium deficiency; The second is to plough the land. Coverage with plastic film, to maintain relatively stable soil moisture, reduce the loss of calcium in the soil; Third, timely irrigation, especially in the result period should pay more attention to the balanced supply of moisture, prevent sudden Hugan. In case of flowering, in case of high temperature and drought, timely watering should be done. During the rainy season, attention should be paid to drainage after the rain to ensure the normal function of the root system. Fourth, nitrogen fertilizer should be applied stably during the early growth period to avoid overgrowth of nutrients and foliar spraying during fruit setting period. % of superphosphate leaching solution, or spraying fresh fruit with Merrill's high-efficiency calcium and calcium products, spraying once every 5-7 days, and spraying 2-3 times. (Yanxian County Plant Protection Station)