Control measures of root rot in soilless cultivation vegetables

Because of the ecological characteristics of soilless cultivation, the disease quickly spreads once the disease is invaded. In particular, some aquatic pathogens will spread to all plants with the circulation of nutrient solution, causing root diseases and becoming a prominent problem for soilless vegetables. Root rot caused by mold is particularly difficult to cure. 1 Symptoms and routes of transmission Soilless cultivars are infected with root rot. Roots initially turn brown and rot, resulting in poor growth, dwarfing, and withering. The pathogens are spread by water, seeds, wind, dust, insects, and humans. The root rot diseased vegetables have a large number of sporangia and zoospores in the nutrient solution, causing disease in neighboring plants and in the same trough, causing the plants to dwarf or die. 2 Control methods 2.1 Seed treatment First, we must select good seeds, require consistent seeds, high germination rate, fast growth, and high uniformity in order to facilitate one-time harvest. After selecting seeds, disinfect before sowing, soaking or drying Heat sterilization can be. Such as the use of 7000mg / L neutral hypochlorite soaking 1h effect is better. 2.2 Strengthen Management In the process of vegetable growth, it is necessary to strengthen management to ensure its healthy and normal growth, thereby enhancing disease resistance. Production practice shows that when the root growth of soilless cultured vegetables is limited, root disease is very easy to occur; when the root is hypoxic, a large number of microorganisms in the root tissue often adhere and invade, even microbes with very weak pathogenicity can cause disease. In addition, we must ensure the uniform supply of nutrient solution to prevent excessive root dryness or high temperature in the vegetables, cause roots to die and die, induce microbial growth and disease, and control growth of the root system by adjusting temperature, nutrient solution concentration, and pH value. To achieve the purpose of controlling disease. For example, fruit rot fungi should be kept below 24°C, and Pythium wide should be above 24°C. High concentrations of nutrient solution can control the occurrence of cucumber wilt, but also can inhibit the formation of Pythium caused by root rot Zoospores, especially Ca(NO3)2, and CaCl2, were not formed at a concentration of 0.25-0.38% at all. 2.3 Sterilization includes disinfection of infrastructure and disinfection of nutrient fluids. Cultivation beds, reservoirs, and drains should be sterilized and sanitized to maintain sanitation. Cultivation beds should be closed above the floor, and the reservoirs should be covered. The liquid gutter should be kept open and drained. The nutrient solution can be sterilized and bactericide can be applied once a month in the nutrient solution by adding 1 g zinc manganese disinfestation per lt of nutrient solution, or adding 1% to every lL of nutrient solution. 20mg can prevent root diseases of tomato, cucumber, sweet pepper, and eggplant by applying Filex once before transplanting and planting. The dosage is 1 ml/L. During cultivation, rock wool, peat and other substrates are cultured with 0.25 ml/L, NFT, etc. The hydroponic system uses 0.1 ml/L, and the drug is used for 4 times throughout the growing period. It can be harvested every 1 to 2 days. 2.4 Strengthen health management Keep the environment clean. You can spread gravel on the ground, plant lawns outdoors, and prohibit idlers from entering. Workers should pay attention to washing hands and feet with disinfectant water to avoid unnecessary pollution. Conditional nutrition solutions can be changed frequently.

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