I. Symptoms Tomato rot is also known as strip rot or iron fruit, which is a common physiological disease that damages tomatoes in protected areas. The main symptom is the local browning on the fruit surface during fruit enlargement, and the unevenness of the fruit surface. The vascular bundles in the pericarp are seen as dark brown stripe necrosis, hardened fruit or browned pulp, and browned vascular bundles. Do not turn red, lose the value of goods. The stems and leaves of the diseased plants had no obvious symptoms. Second, the cause of the disease and conditions of lack of light, soil temperature is too low, soil moisture is too large, too much nitrogen, potassium deficiency or soil compaction and other factors. Third, pollution-free control technology 1, selection of disease-resistant varieties. Jia Yuya, Xiuli, Duofiya, 189 and other varieties are resistant to the disease. 2, rotation for change. It is particularly important to implement crop rotations in heavily protected areas, which will help ease the imbalance of soil nutrients. 3, enhance lighting. The greenhouse lighting angle must be reasonable. Select materials with high light transmittance and good insulation properties, and pay attention to keep the film clean. According to the characteristics of varieties, they should be properly planted and sparsely planted to prevent excessive density and over-emergence of seedlings and increase the light transmittance among plants. 4, science watering. After the sunny days in the protected area, do not rush to water in the shade after sunny days to prevent the soil temperature from being too low for a long period of time. After the soil temperature is restored, water it again. Rainy days do not water, sunny morning watering, the use of under-membrane irrigation or drip irrigation, bogey flood irrigation. 5, scientific fertilization. Nitrogen, phosphorus, potassium with appropriate, to avoid partial nitrogen fertilizer, especially one-time application of available nitrogen fertilizer should not be too much. Promote the application of organic fertilizers to increase soil permeability. Carbon dioxide gas fertilizer is added in winter to meet the needs of photosynthesis, to maximize photosynthesis and promote the transport and accumulation of photosynthetic products. During fruit enlargement, spray potassium dihydrogen phosphate 2000 times, aureus 800 times, state apron protein organic fertilizer 80 times, farm meat 2000 times, Fengbao II 600 times or chlordecone 800 Liquid and other leaf fertilizer. The following methods can be considered for the top dressing during the fruit expansion period: 2 kg per mu, or 20 kg of gourd or 15 kg of potassium dihydrogen phosphate, or 40 kg of state organic fertilizer. 6, cultivating loose soil. Timely cultivating loose soil, especially during the cold period in winter, is conducive to enhancing soil permeability and preventing soil rot caused by tendon rot.
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