How to prevent cucumber downy mildew in greenhouse
First, skillfully adjust the temperature and humidity: to avoid the occurrence of downy mildew the most appropriate temperature and humidity (temperature around 18 °C, humidity above 83%). In the morning, the temperature of the shed is controlled at about 28°C and the humidity is below 75%. In the afternoon, the temperature is adjusted at about 23°C and the humidity is about 70%. Use the low humidity at night in the middle of the night to regulate the humidity in the shed to below 80%; use the low temperature in the middle of the night to regulate the temperature in the shed above 13°C to control the occurrence of the disease.
Second, the use of high temperature sheds: selected in the sunny noon to seal the shed, so that the shed temperature quickly rose above 43 °C, continued for 2 hours after the release of wind, once a week.
Third, skillful pouring timely water: Watering should be carried out in the morning on sunny days, do not pour on rainy days, look at the land, see seedlings, determine the number and frequency of watering.
Fourth, Qiao complement appropriate period of fertilizer: Applying carbon dioxide gas fertilizer in the melon period, spraying 0.1% urea and 0.3% potassium dihydrogen phosphate in the later stage can improve the disease resistance of cucumber.
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