How to prevent continuous shed damage
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(1) Rotation: A crop rotation of two years or more can reduce the occurrence of diseases and inhibit the growth of harmful microorganisms. Non-permanent greenhouses should preferably be planted alternately between protected land and open land. Drought and rotation are also better ways. (2) Disinfection of pharmaceuticals: 50-100 times of formalin (40% formaldehyde) can be used to disinfect the soil in the greenhouse and seedbed soil. When the soil is used, the soil in the greenhouse is first loosened, sprayed evenly on the ground with a sprayer, and then slightly turned, so that the soil in the cultivation layer can be stained with liquid chemicals, and the plastic film covers the ground for two days, so that the formaldehyde can fully exert its bactericidal effect. Afterwards, the ventilation of the plastic film was lifted and the formaldehyde vapor was emitted. The seeds could be sowed or planted two weeks later. The soil can also be topped with 1000 times of 50% carbendazim or 50% thiophanate-methyl or 70% dexamethasone or 50% phoxim. In downy mildew and disease-causing greenhouses, 200-300 times of copper sulfate solution can be used to irrigate the soil. If the cucumber is withered, if it is not soil-sterilized prior to planting, it can be applied with 50% thiophanate 1.25 kg, or 50% carbendazim 0.75 kg, or 70% pentachloronitrobenzene 0.7 kg per mu when planting. When spraying, first mix the powder with 1:100 finely ground and spread it in the planting ditch. (3) Smoke Smoking Disinfection: Generally 2-3 days before sowing or planting. The specific method is, every 40 cubic meters of greenhouses, with sulfur powder 250 grams, add 50% thiophanate WP 2 grams, 500 grams of sawdust, placed in several pots, distributed throughout the greenhouse, lighting, closed fumigation 24 hours, have certain effect on the control of tomato leaf mold, cucumber powdery mildew and so on. (4) High-temperature fever disinfection: In July and August high temperature weather, the greenhouse was closed, and 2 tons of raw straw and 70-80 tons of lime nitrogen were applied per acre, and the soil was deeply turned to about 20 cm. The table is covered with old film, then flooded with water, so that the water temperature can reach about 50°C during the day, and the temperature can reach about 70°C at the surface of 5cm. After two weeks, the water is released and the vegetables are ploughed again. Due to the large amount of straw and lime nitrogen applied in the method, the amount of nitrogen in the soil is too much. Therefore, three consecutive irrigations are needed to eliminate salt and excessive nitrogen fertilizer. Generally, the lower pod vegetables can no longer be re-applied with nitrogen fertilizer. (5) Grafting and disease prevention: Using disease-resistant crops or varieties as rootstocks, susceptible crops or varieties as panicles, and grafting and cultivation. (6) Increase the application of organic fertilizers, phosphorus and potassium fertilizers and lime to improve the soil, increase fertility, increase resistance, and promote fertility.