According to the weather conditions, ventilation and cooling, dehumidification, shed indoor maximum temperature does not exceed 25 °C, relative humidity should be controlled below 75%, pay attention to the bottom of the greenhouse should increase the apron, the bottom outlet is strictly prohibited. To make full use of basic fertilizers, basal fertilizers should be mainly composed of high-quality organic fertilizers that are fully decomposed, and the application amount of phosphorus and potassium fertilizers should be appropriately increased. Promote micro-pipes, drip irrigation or infiltration irrigation, avoid flood irrigation. After the leek is harvested, the diseased leaves and diseased plants must be removed in time, and the diseased plant residues should be brought out of the shed to be burnt or buried so as to prevent the spread of germs. At the beginning of the disease, 50% carbendazim WP, 70% thiophanate-methyl, etc. can be used for prevention and control, sprayed once every 10 days, and sprayed 2-3 times. After each harvest, spray precautions must be taken.
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