Toxicity of tomato umbilical rot
Recently, the emergence of tomato umbilical rot occurred in greenhouses in Liangshuiqiao Village, Yutian County. The symptoms were the appearance of water-soaked lesions on the umbilicus when the fruit grew to a large size, and then gradually enlarged, resulting in depression and browning of the top of the fruit. The lesions are usually 1-2 cm in diameter and, when severe, spread to a small half of the fruit. In the dry condition, the diseased area is leathery. When it encounters wet conditions, the surface produces various layers of mold, often white, pink and black. The onset is usually on the first to second ear fruit. The disease is a physiological disease caused by imbalances in water supply, calcium deficiency, and lack of boron, and the disease is severe in high temperature and drought conditions. Farmers tend to mistakenly believe that they are fungal diseases and mistakenly prevent and control, delay the timing of prevention and control, and increase the cost of medication. Here, to remind farmers to timely prevent and treat the disease. Suggested prevention and control methods: 1. Pouring sufficient water for planting to ensure sufficient water supply during flowering and early results. After fruit enlargement, proper water supply should be noted. 2. When growing seedlings or planting, the seedlings with the same growth should be put together to prevent the individual plants from being too large and lacking in water, causing umbilical rot. 3. Use resistant varieties. Smooth, sharp-tolerant varieties of tomato skin are more resistant to diseases and are used in regions where umbilical rot develops. 4. The mulching film can keep the soil moisture relatively stable and reduce the leaching of calcium nutrients in the soil. 5. The use of shade net cover to reduce the excessive transpiration of plant water is also beneficial to the prevention and treatment of this disease. 6. Top-dressing calcium fertilizer out of roots. Within one month after the tomato result, it is the key period for absorbing calcium. Can be sprayed with 1% of superphosphate calcium leachate, 0.5% calcium chloride solution or 0.1% calcium nitrate solution. From the beginning of the flowering stage, spray once every 10-15 days and spray 2-3 times continuously. When using calcium chloride and calcium nitrate, do not mix with sulfur-containing pesticides and phosphates (such as potassium dihydrogen phosphate) to prevent precipitation. Incubator & Oven Products,Oven Products,Constant-Temperature Incubator,Thermostat For Incubators Guangdong Widinlsa International Co.Ltd , https://www.widinlsas.com