First, the situation has occurred. 1. Seedling diseases: The diseases of vegetable seedlings mainly include rickets and blight. The two are often mixed in the seedbed, causing a large number of dead seedlings in severe cases. 2. Botrytis cinerea: It mainly occurs in greenhouse vegetables such as tomato and eggplant, as well as leafy vegetables such as vegetables and leeks. The current weather conditions are conducive to the spread of the disease. A few days ago, the field also had old Shouxing disease strains. 3. Sclerotinia: The disease is a major new disease in greenhouse vegetables in recent years. It is mainly caused by vegetables such as eggplant, green pepper and lettuce, which is increasing year by year. 4. Downy mildew: It occurs on the lettuce in the field and in the greenhouse. It occurs lightly in the field, but it is common in the greenhouse. The adult stage is especially serious in the seedling stage. A few days ago, the census of lettuce in the greenhouse was nearly 100%, and the diseased leaf rate was 45% (30-70%). The seedling stage was lighter and only sporadic diseased plants appeared.
Second, prevention measures. To prevent and control greenhouse vegetable diseases, comprehensive prevention and control measures should be taken to prevent pollution and combine agricultural control with chemical control. 1. Agricultural control: clean the garden in time, clean the sick and timely plants and bring them out of the field, focus on the treatment, avoid throwing or dumping the sick plants into the ditch to prevent cross-infection; strengthen the ventilation and cooling of the greenhouse. 2, chemical control: (1) seed disinfection before sowing, can reduce the occurrence of seedling disease. In the early stage of the disease, the seedlings are immediately removed, and then 75% chlorothalonil WP800 ~ 1000 times solution or 50% Fumei double WP500 times solution is used for uniform spraying. (2) It can be evenly sprayed with 50% Suikeling WP1000 times liquid, which can effectively prevent various diseases such as gray mold, sclerotinia and early blight. (3) It can be uniformly sprayed with 50% sterilized into water-soluble powder 1000-1500 times, which can effectively prevent downy mildew.
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