Bulging disease is a common disease in vegetable seedlings. Only a few seedlings are onset at the time of origination. If they are not controlled in time, they can cause seedlings to fall into seedlings. At present, it is a crucial period for vegetable nursery and planting in spring greenhouses in the northern region and vegetable nursery for spring greenhouses. In a recent production survey, it was found that some of the nursery shelters had severe occurrence of damping-off. The following describes briefly the damage characteristics and prevention methods of vegetable damping-off during seedling period so that vegetable farmers can carry out early prevention and reduce damage. Symptoms: The disease is caused by the genus Pythium. The disease is very profuse and can survive long-term in the soil and in the body. Seedling stem base near the base of the disease, the initial appearance of water-stained lesions, like boiling water burned like, and then into a brownish rotten, dry and around the stem 1 circle, resulting in the young stem after contracture lodging. Incidence of disease: The pathogens overwintered with oospore and mycelia in the diseased body, soil and humus. The germs are mainly spread through the sick, the soil, and the water, and they can also be spread by carriers of manure and agricultural operations. The soil temperature of 15°C-16°C breeds rapidly, and soil moisture can easily induce this disease. After watering seedbed water or seedbed roof drip at the onset center. Insufficient light, weak seedling growth, cold period of seedling or cold rain, snow weather, low temperature and humidity, serious disease. Control methods: Prevent and control damping-down disease should adhere to the "prevention-based, comprehensive prevention and control" approach, pay attention to source control. 1. The selection of disease-free new soil or use of substrate for seedlings in seedlings requires a loose texture and good air permeability. Fertilizer fully cooked and pay attention to Shi. The seedbed should be as flat as possible to prevent the occurrence of damping-off caused by stagnant water after watering. 2. Seed disinfection. Seeds are soaked in water for 2-3 hours before sowing, then soaked in 1% potassium permanganate or 10% trisodium phosphate for 5-10 minutes, and the seeds are removed and washed with water. The liquid dosage is 2 times that of the seed. 3. Nursery soil disinfection. 60% sulfur sulphosodium wettable powder, 10% difenoxysuccine wettable powder or 45% pentachloro thiram wettable powder can be used for soil treatment. 4. Water and fertilizer management. Bottom water after adequate control of water pouring, especially after sowing and just emerged, should pay attention to appropriate water control and improve the management of temperature, avoid pouring large flooding or flooding. 5. Chemical control. Timely removal of diseased seedlings and adjacent diseased soils, combined with chemical control, can be selected using H. harzianum wettable powder, 38% methionine WP, 66.5% rosemone hydrochloride, 20% copper acetate wettable powder, etc. Irrigate the roots, and then spread evenly the fine soil or plant ash to reduce the humidity of the seedbed. Pay attention to increase the soil temperature after application. standard Safety net standard Safety net Shandong Binzhou Yong'an Labor Protection Factory , https://www.zhuqiangsafetybelt.com