Prevention and cure of diseases in winter and spring greenhouses

Winter and spring greenhouse vegetables are susceptible to damping-off and blight. Eggplants, tomatoes, peppers, and melons cause seedlings and seedlings to die after they become ill and in the growing season. In order to ensure that vegetables in greenhouses are ripe, high-quality, high-yield and stable, we must conscientiously do a good job in preventing and controlling the two major diseases. First, the symptoms of disease 1, damping-off disease. From the sowing of vegetables to the entire seedling period can be disease. The incidence of young stems close to the ground, the diseased parts have water-stained yellow-brown lesions, and gradually collapsed and rotted; seedlings soon after the onset of lodging, died a few days later. At high temperatures, the disease is densely covered with white cottony mould. The higher the temperature, the greater the damage. 2, blight. Harmful seedlings and large seedlings. At the beginning of the stem, round spots of dark brown disease were produced, and the lesions gradually sag and expand around the stem one week. Leafy vegetables above 23 °C shrinkage and dry, diseased seedlings died. The roots are not damaged, the cortex rots, and then the leaves turn yellow and die. When wet, the diseased area often has light brown spider silky mildew. Second, the prevention and control methods 1, to strengthen the seedbed management. After emergence, warm sunny days should be selected to lift the membrane and regulate the seedlings, ventilation and ventilation, and strictly control the humidity of the seedbed. The daytime bed temperature should be controlled at 20-30°C and should be controlled at about 18°C ​​during the night to prevent high temperature and humidity. In addition, watering should not be excessive, timely removal of diseased seedlings, burning or deep burial, and sprinkle lime to disinfect the affected area. 2, timely medication control. If there are sporadic diseases after emergence, they should be sprayed and controlled in time: 95% of dexamethasone wettable powder 1000 times; or 50% carbendazim WP 800 times, spray once every 7-10 days. Even spray 2-3 times, you can achieve the desired control effect.

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