Cucumber downy mildew is a devastating disease. Most of the pesticides are generally controlled by spraying chemical methods. According to tests, pollution-free control measures can also be used to achieve good results, but also reduce costs and improve quality. The main measures are:
1 high temperature stuffy shed. Select noon on the sunny day to close the greenhouse, so that the temperature inside the greenhouse quickly rose to 45 degrees, and after 2 hours, the air was released to cool down. The general stuffy shed 1 times, can control the condition for 10 days. Be careful to pour enough water on the day before the implementation of the high temperature dada.
2 warming and cooling. Raising the greenhouse temperature in the greenhouse to reduce the humidity in the greenhouse is conducive to the growth of cucumber, and it can effectively inhibit the occurrence of downy mildew. The method is: in the morning through the sealed greenhouse, so that the temperature of the shed rose to 30-32 degrees. In the afternoon, the temperature dropped to 20-22 degrees, and the humidity in the greenhouse dropped to 60%-70%. In addition, it can also use mulch film, rice (wheat) grass, stove ash and other methods to cover all or part, improve the shed temperature and reduce the temperature inside the shed.
3. Foliar spraying fertilizer. During the period of cucumber growth in greenhouses, spraying foliar fertilizers to supplement nutrients can provide the plants with nutrients quickly and effectively, which can promote the growth of cucumbers and increase disease resistance. Generally, it is sprayed once every 10 days or so, and each time, 50 kg of nitrogen, phosphorus, potassium and boron mixed solution is sprayed. The solution is prepared by adding 50 grams of urea, 100 grams of potassium dihydrogen phosphate, and 100 grams of borax per 50 kilograms of water. The boron must first be dissolved in a small amount of water before it is mixed.
4 spray sugar solution. Disturbance studies have shown that the severity of downy mildew is closely related to the sugar-nitrogen ratio in cucumbers. During the growth period of cucumber, spraying 1% of white sugar and 1% of urea mixed solution can prevent more than 80% of the disease. General spray 5-8 times.
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