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First, freeze-chilled peppers and eggplants are suitable for daytime temperatures above 25°C and nighttime temperatures above 15°C. The daytime temperature of tomatoes should be above 20°C and not less than 8°C during the night. When cold air arrives, thermal insulation should be strengthened, or artificial warming measures should be taken to prevent cryogenic damage caused by low temperatures. 2. Blight occurs in the middle and late stages of nursery. Ovicular dark brown lesions are generated at the base of the seedlings of the affected seedlings. The early diseased seedlings are wilt during the day and recover at night. After the lesion gradually sag. After the development of lesions around the stem one week later contracture occurs, the roots gradually dry and wilting until dead. Control methods 1, seedbed selection. As far as possible, it is built on the ground of unripe oysters. Do not build old seedbeds. To build a bed in an old seedbed, it is necessary to replace the soil with less germs or to disinfect the soil. Fertilizer must be cooked. 2, nursery technology. Use modern seedling raising techniques, such as electric hotbed technology, manual temperature-controlled seedling raising techniques, etc. to maintain a suitable temperature for the seedbed. 3, bed soil disinfection (1), formalin disinfection: 2 to 3 weeks before sowing, the bed soil is loose, press the formalin per square meter bed 50 ml, add water, 18 to 36 kg (water added by soil Wet and dry to decide), evenly poured on the seedbed. Then covered with plastic film on the bed soil. After 3 to 5 days, remove the cover and loosen the soil. After about two weeks, the liquid is fully evaporated and then sown. (2) Disinfection of pentachloronitrobenzene, etc.: Mix 70% of quintozene with 50% of thiram and mix it equally, 8 to 10 grams per square meter (4 to 5 grams for each drug). Add dry fine soil 20-30 kg and mix well. Before sowing, 1/3 of the medicine soil is spread on the bed surface first as a bedding soil, then the seeds are sown on the pad soil, and the remaining 2/3 of the medicine soil is evenly covered on the seeds as cover soil. After covering the soil, the surface of the soil should be sprinkled with water to keep the soil moist, and the soil should not be too dry so as to avoid phytotoxicity. (3), carbendazim or thiophanate disinfection: use 50% carbendazim or 50% thiophanate, 8 to 10 grams per square meter, using the same method. (4), the enemy cough pine powder disinfection: with 70% of the original enemy pine powder, 500 grams per mu of medication, plus fine dry soil 20 to 25 kg, used before sowing. 4, seed treatment. Before sowing, seeds are soaked in warm water of 48°C to 49°C for 10 to 15 minutes. Or use 50% of Fairchild WP, ​​or 65% zein zinc wettable powder. The dosage is 0.3% of seed weight. 5. Seedling management seedlings. The bed temperature should be appropriate to reduce cold damage. Appropriately increase the number of soil loosening and promote root growth. Control the appropriate humidity. In the early stage of emergence, it is possible to scatter the soil 1 to 2 times on the surface of the bed in order to protect the ground and make up for cracks in the ground. When the humidity of the seedbed is too high, the number of ventilations should be increased when the temperature is high, the humidity of the seedbeds should be eliminated, and the humidity of the seedbeds should be reduced. When the nursery's drought must be watered, it should be done in the morning. Immediately after the watering, the plastic film is tightly sealed to raise the temperature of the seed bed. When the temperature is high at noon, the air is ventilated. The amount of water used was the degree of soil moisture in the rhizosphere of the seedlings. Take all measures to improve the light conditions of the seedbed. Lift the insulation covering timely to prolong the time of light exposure. After seedling emergence and time seedlings, seedlings should be divided in time to prevent seedlings being too dense, affecting ventilation and light transmission, resulting in excessive humidity and causing seedlings to grow weak. When the watering or seedbed humidity is too high, dry ash on the seedbed can be sprinkled several times. Dry ash has the functions of absorbing moisture, reducing moisture and increasing light absorption, increasing the temperature of the ground, and inhibiting the growth of bacteria. The diseased seedlings were found to be removed in a timely manner and carried deep outside the field or burned. Spray 1PPM natural algae - Shuofeng 481 once to improve disease resistance. 6. Chemical control. After the diseased seedlings are found, the following agents can be used: 75% chlorothalonil wettable powder 600 times; 64% antivirus WP 500 times; 70% mancozeb wettable powder 500 times; 70% enemy pine 1000 times liquid powder. Select one of the above agents, or use them alternately, once every 7 to 10 days, and spray 2 or 3 times. Third, the roots of young roots are not new, and the roots are yellow and brown and finally rot. The growth of the aerial parts was inhibited, and the leaf color was pale or yellow, no new leaves were produced, and the wilting-like appearance was mostly observed around noon during the day. Seedlings are easy to pull up. Prevention and treatment methods The disease is a physiological disease without the need for spraying. Fourth, the wind seedlings without ventilation exercise seedlings, long-term exposure to air humidity environment, transpiration is not very strong, if suddenly hit by strong winds, transpiration increased suddenly, destroying the original root water absorption and transpiration The balance between the two often results in the dehydration of tender leaves and the lack of timely supplementation. If the wilting time is too long, the leaves will not recover, and eventually it will die in green. This phenomenon is called "air drying." Preventive measures: When the seedbed is ventilated, it must be small to large. Do not be too rushed to make the seedlings have an adaptation process. When encountering strong winds, be careful not to allow the wind to blow away the cover. 5. The sunless wilt seedlings are exposed to low light conditions of 10,000 lux for a long period of time. If they suddenly become exposed to strong light conditions of 20,000 lux, wilting may easily occur. The symptoms are: the tip of the leaf is curled upwards, and over time, the leaves are green and dry. Preventive measures to make the seedlings from low-light conditions to strong light conditions should be gradual, not too sudden, the use of partial shade measures; morning, afternoon light, noon coverage, so that the seedlings have a process of adaptation.