Downy mildew is one of the major diseases in the production of cucumber. The disease mainly invades the functional leaves of cucumber, spreads quickly and quickly, and has a great harm to the production. It can even reach the point of destroying the field seriously. Here, the cucumber downy mildew is introduced. Ecological control technology.
First, to reduce the production of shed in the environment as the center of measures to maximize the use of water under the membrane, conditions can be taken to drip irrigation technology to prevent flood irrigation, the use of sunny water supply method, water, cloudy and rainy days must not be watering.
Second, control temperature and humidity in the morning at 7 to 13 closed greenhouse heating, so that the temperature within the shed quickly rose to 25-30 °C, more than 33 °C open small joints, the relative humidity gradually decreased to 75%. 13-18 o'clock in the afternoon to open a large joints, cooling humidity, to maintain the temperature inside the shed at 20-25 °C, relative humidity below 70%, not suitable for downy mildew. At the time of 18-0, the relative humidity in the shed gradually increased to 80%. The temperature gradually decreased to 15-20 °C, the bacteria slowly. From 0 midnight to 8 am the next morning, the relative humidity in the shed can reach more than 90%, but due to the temperature dropped to 10-13 °C, it is not suitable for infection by bacteria at this time. Use the temperature control and humidity control method in the above day to block the smooth infection of pathogens.
Third, high-temperature stuffy sheds The cucumbers were poured once a day before the high-temperature sterilization to control cucumber downy mildew, and the greenhouses were closed the next day. A thermometer was placed inside the shed. Using solar heating at noon on a sunny day, it rises to 44-45°C in a short period of time, maintains for 2 hours, and then slowly releases air to cool the temperature to normal room temperature, which is conducive to the normal growth and development of cucumber. Spray once before using this method.
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