Various kinds of vegetable seedlings are about to begin. The most common ones in seedling raising are the damping-off during seedling stage. Bleeding-falling disease is a relatively common disease in eggplant vegetables, melon vegetables and cabbage vegetables, whether in winter or spring. Nursery or summer and nursery will occur. After the seedlings have been unearthed, if the true leaves have not yet been unfolded, water-stained dark spots will appear on the bases of the seedling stems if they are infected with pathogens, and then continue to expand around the stems and gradually shrink into thin lines, so that the above-ground parts of the seedlings are lost. Supporting ability and lodging on the ground. When the humidity of the seedbed is high, white cotton flocculent hyphae often appear on the surface of the infected seedlings or nearby beds. Budding disease mainly occurs in the seedling stage before 1 or 2 true leaves.
The main technical measures for the prevention of damping-off are as follows:
1. Determine the appropriate sowing date, check the weather forecast before sowing, choose sunny gas sowing, and appropriately dilute the seed, then the seed emergence is quick and rapid, and the seedlings are relatively thick, which can reduce the occurrence of damping-off disease to a certain extent.
2. Soil nutrients used in bed soil disinfection and nursery must be long-term composting, and it is best to pass a hot, humid summer and use formalin to seal and disinfect. Before bed soil is used, 50% carbendazim wettable powder can be added by using 8 to 10 grams of powdered powder per square meter (generally mixed with 4 to 5 kilograms of fine soil). Before sowing, firstly soak the bottom water. After the water is soaked, take 1/3 of the soil and spread it on the seedbed, then sow the seed that has germinated, and finally cover the remaining 2/3 of the soil.
3, seed disinfection can be soaked in warm water, liquid soaking or medicinal powder seed dressing and other methods for disinfection.
4. Strengthen the seedbed management to remove the covered film and straw timely after emergence, and conduct ventilation cooling and dehumidification. Timely deletion of seedlings and removal of seedlings into the seedlings, when entering the seedlings, pay attention not to hurt the stems of seedlings, so as to avoid the incidence of pathogenic bacteria caused by human wounds. After the vaccine has survived, it should be ventilated in time to reduce the temperature and humidity of the seedbed so that the seedlings can receive more sunlight.
5, timely after the onset of the use of chemical control in the early onset, if the weather is fine, the general use spray spray, available 75% chlorothalonil WP 600 times, or 50% carbendazim WP 600 times, using the above Sprays can increase resistance. If it is rainy weather, or if the humidity of the seedbed is high and the bed soil is wet, the spraying effect is often poor. At this time, dry medicine can be used to spread the soil in the seedbed, especially near the diseased seedlings. The formulation of the medicinal soil can refer to the formula for disinfecting the bed soil, and 75% chlorothalonil wettable powder can also be used for soil mixing. If there is no medicine, clean dry fine soil can be sprinkled.
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