Tomato umbilical rot in the spring, summer and autumn are easy to occur in the three seasons, especially in tomatoes this year, the appearance of umbilical rot is more serious, affecting the commerciality of tomatoes, the following to introduce the prevention and treatment methods for umbilical rot.
First, the disease analysis: tomato umbilical disease is a physiological disease, is a symptom of tomato calcium deficiency, generally in the case of high temperature and drought prone to occur. Because of the lack of water in greenhouses, tomato's ability to absorb calcium will decrease. Therefore, drought, especially dry weather, will affect the absorption of calcium by tomatoes, leading to the appearance of umbilical rot in fruits.
Second, the disease: the most vulnerable to disease. Lesions occur in the umbilical part of the fruit, which is the remnant part of the flower, and it is called the umbilical rot. In the initial stage of the disease, the water was immersed in dark green, and the collapse of the flesh tissue at the diseased site was significantly flattened. The healthy part of the victim’s fruit turns red in advance. The diseased part is often infected with saprophytic bacteria under moist conditions, producing dark green, black or pink moldy on the lesions.
Third, the incidence of conditions: young tomatoes and immature green fruit easy to disease, the fruit is generally not disease after maturation. After the rainy season, followed by drought, or excessive irrigation in the early stage, no irrigation in the later period, and the plants often suffer severe drought when they suddenly suffer from drought. Roots of tomatoes are stunted, or the roots are injured. They cannot absorb water normally, and they are also susceptible to umbilical rot. If the application of organic fertilizer is not well cooked or over-fertilized caused by burning roots, thereby affecting the normal absorption of water, the incidence is often severe. Sandy soil or viscous soil will make the soil moisture change too much, the soil alkaline too heavy, affecting root water absorption capacity are easy to disease.
Fourth, control methods:
1 Strengthen management to ensure even supply of plant water, especially when the temperature rises sharply in early summer, it is necessary to pay attention to the supply of water, and field watering should be carried out in the morning or evening.
2 Select the strong sandy soil soil with tomato fertilizer. Too much soil or excessive sandy soil should be combined with deep tillage and organic fertilizers, such as compost and green manure, to improve soil properties and increase their ability to retain fertilizer and water.
3 Reasonable fertilization. Avoid using unripe organic fertilizers, or applying excessive fertilizer concentrations to burn the root system. Pay attention to the reasonable application of nitrogen, phosphorus and potassium fertilizers. Do not apply nitrogen fertilizer too much. In the 30 days after the start of fruit set in the tomato, appropriate application of calcium fertilizer, available Riparel calcium or 1% superphosphate, 0.1% calcium chloride or 0.1 ammonium calcium nitrate or green Fenway III (a bag of 2 to 3 sprayer Foliar spraying, spraying once from the initial flowering stage, spraying once every 15 days can receive good disease-preventing effect.
4 can be applied calcium ammonium nitrate. Apply 20 to 30 pounds per acre each time, every 2 to 3 flushes, the effect is good.
First, the disease analysis: tomato umbilical disease is a physiological disease, is a symptom of tomato calcium deficiency, generally in the case of high temperature and drought prone to occur. Because of the lack of water in greenhouses, tomato's ability to absorb calcium will decrease. Therefore, drought, especially dry weather, will affect the absorption of calcium by tomatoes, leading to the appearance of umbilical rot in fruits.
Second, the disease: the most vulnerable to disease. Lesions occur in the umbilical part of the fruit, which is the remnant part of the flower, and it is called the umbilical rot. In the initial stage of the disease, the water was immersed in dark green, and the collapse of the flesh tissue at the diseased site was significantly flattened. The healthy part of the victim’s fruit turns red in advance. The diseased part is often infected with saprophytic bacteria under moist conditions, producing dark green, black or pink moldy on the lesions.
Third, the incidence of conditions: young tomatoes and immature green fruit easy to disease, the fruit is generally not disease after maturation. After the rainy season, followed by drought, or excessive irrigation in the early stage, no irrigation in the later period, and the plants often suffer severe drought when they suddenly suffer from drought. Roots of tomatoes are stunted, or the roots are injured. They cannot absorb water normally, and they are also susceptible to umbilical rot. If the application of organic fertilizer is not well cooked or over-fertilized caused by burning roots, thereby affecting the normal absorption of water, the incidence is often severe. Sandy soil or viscous soil will make the soil moisture change too much, the soil alkaline too heavy, affecting root water absorption capacity are easy to disease.
Fourth, control methods:
1 Strengthen management to ensure even supply of plant water, especially when the temperature rises sharply in early summer, it is necessary to pay attention to the supply of water, and field watering should be carried out in the morning or evening.
2 Select the strong sandy soil soil with tomato fertilizer. Too much soil or excessive sandy soil should be combined with deep tillage and organic fertilizers, such as compost and green manure, to improve soil properties and increase their ability to retain fertilizer and water.
3 Reasonable fertilization. Avoid using unripe organic fertilizers, or applying excessive fertilizer concentrations to burn the root system. Pay attention to the reasonable application of nitrogen, phosphorus and potassium fertilizers. Do not apply nitrogen fertilizer too much. In the 30 days after the start of fruit set in the tomato, appropriate application of calcium fertilizer, available Riparel calcium or 1% superphosphate, 0.1% calcium chloride or 0.1 ammonium calcium nitrate or green Fenway III (a bag of 2 to 3 sprayer Foliar spraying, spraying once from the initial flowering stage, spraying once every 15 days can receive good disease-preventing effect.
4 can be applied calcium ammonium nitrate. Apply 20 to 30 pounds per acre each time, every 2 to 3 flushes, the effect is good.
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