Prevention and cure of cucumber downy mildew in greenhouse
2023-10-12 13:10:10
Cucumber downy mildew is a devastating disease. Most of them are controlled by chemical methods of spraying pesticides. According to the test, pollution-free measures can also be taken, and good results can be obtained, and expenses can be reduced and quality can be improved. The main measures are:
1 High temperature shack. At noon on a sunny day, the greenhouse was sealed, and the temperature in the shed was quickly raised to 45 degrees. After 2 hours, the wind was cooled. Generally, the shack is once, which can control the condition for 10 days. Note that the water should be poured on the day before the implementation of the high temperature suffocating shed.
2 Warming and dehumidification. Increasing the temperature in the greenhouse and reducing the humidity in the greenhouse is conducive to the growth of cucumber, and can effectively inhibit the occurrence of downy mildew. The method is: in the morning, through the sealed greenhouse, the temperature of the shed is raised to 30-32 degrees. After the afternoon, the air is lowered to 20-22 degrees, and the humidity in the shed is reduced to 60%-70%. In addition, the method of covering all or part of the mulch film, rice (wheat) grass, and ash can be used to improve the temperature in the shed and reduce the temperature inside the shed.
3 Foliar spray fertilizer. During the growth of cucumber in greenhouse, reasonable application of foliar fertilizer to supplement nutrients can quickly and effectively provide the required nutrients to the plants, promote cucumber growth and improve disease resistance. Generally, it is sprayed once every 10 days, and 50 kg of NPK-boron mixed solution is sprayed per acre. The solution was prepared by adding 50 g of urea, 100 g of potassium dihydrogen phosphate and 100 g of borax per 50 kg of water. Before boron dosing, dissolve it with a small amount of hot water.
4 Spray the sugar solution. Disturbance studies, the severity of downy mildew is closely related to the ratio of sugar to nitrogen in cucumber. During the growth of cucumber, spray 1% white sugar and 1% urea mixed solution, the disease prevention effect can reach more than 80%. Generally spray 5-8 times.
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