The pathogen of cucumber downy mildew is the flagellin subfamily Pseudoperonospora genus, and the temperature and humidity have a great influence on the occurrence and prevalence of the disease. Generally, the temperature is between 15 and 20°C, and the relative humidity is above 70%. In particular, when there are more rainy days or more foggy days, there is a water film on the leaves and the disease spreads rapidly. Therefore, the prevention of cucumber downy mildew can be achieved by cultivating strong seedlings, adjusting temperature and humidity, and strengthening the fitness management and other agricultural measures.

Cultivating strong seedlings is best to use pumpkin seedlings as root stock grafting seedlings, and select excellent disease-resistant varieties for scion, grafted cucumber seedlings with well-developed root systems, strong stress resistance, and less prone to downy mildew.

Adjust the temperature and humidity in the shed by controlling the ventilation to regulate the temperature and humidity inside the shed so that it is conducive to the growth and development of cucumbers and is not conducive to the growth of bacteria. On sunny days, when the temperature permits, the grasshopper is released for 30 minutes to reduce the humidity to about 75%. Then, the greenhouse is closed tightly, so that the temperature of the greenhouse is rapidly increased to above 28°C, and the temperature and humidity are both limited and the disease is suppressed. occur. When the temperature exceeds 30°C, put a small wind, the temperature in the morning is controlled at 28-32°C, and the ventilation can be increased in the afternoon to make the temperature of the greenhouse at 20-25°C and the relative humidity below 70%, which is beneficial to the photosynthesis of the leaves and realizes Humidity unfavorable single factor control disease. After the night, the disease was alternately limited by temperature and humidity, the relative humidity was less than 75% in the middle of the night, the temperature was controlled at 15 to 20°C, and the disease was controlled by low humidity; although the relative humidity reached 90% or more at midnight, the temperature was only 10 to 15°C. Use low temperatures to control the disease.

Timely and appropriate amount of water according to the weather, soil moisture, seedling timely watering. Do not water on rainy days, noon and night so as not to increase the humidity in the shed. In the sunny morning, the use of film under the pouring of dark water, not only save water, but also can increase the temperature, reduce the humidity within the greenhouse, can effectively prevent the occurrence of downy mildew. Immediately after the watering, close the shed and allow the shed temperature to rise to 32°C for 1 hour (if the shed temperature is lower than 25°C, close the shed to raise the temperature to 32°C and maintain for 1 hour), and then ventilate and cool.

High-temperature stuffy shed processing using the temperature above 30 °C when downy mildew pathogens are inhibited, 42 °C can kill the bacteria characteristics, can be used in sunny days at noon with high temperature stuffy shed method to control the disease. In order to prevent the cucumber from being heated, one can pour water once a day before the drapery. Hang a thermometer above the growing point of the cucumber, first increase the temperature of the canopy to 40°C, and then slowly rise to 45°C for 2 hours. The temperature must not be lower than 42°C, nor can it exceed 47°C (burning of growth points beyond 47°C). Then, from small to large, the temperature of the shed was reduced to about 28°C and normal management was performed. After 10 days, it can be drenched once more to effectively control the disease development.

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