Cucumber gray mold and downy mildew are common diseases in cucumber cultivation in greenhouses. They cause great harm each year. If they are not controlled in time, it will lead to a reduction of cucumber production, which will cause irretrievable losses to growers. Recently, Professor Li Yuhong, a professor of horticulture at the Northwest Agriculture and Forestry University and a vegetable expert, provided guidance for growers on preventing and controlling cucumber gray mold and downy mildew, for reference.
Prevention of gray mold
Botrytis cinerea mainly damages cucumber flowers, melon strips, leaves and stem vines, and gray moldy crops are formed. When severe, the melon vines break and the plants die. Li Yuhong reminded that we should pay attention to the conditions of temperature and humidity in the shed to prevent light from being too weak and the humidity is too high. We must remove the diseased flowers, diseased melons and diseased leaves in time and take them out of the shed. At the initial stage of gray mold, 50% Succolone WP 2000 times solution or 50% Propionine WP 1500 solution may be used for spraying, and once every 6 to 7 days for continuous treatment. 3 to 4 times.
Prevention of downy mildew
Downy mildew is a fungal disease that can be transmitted with the aid of airflow. It is difficult to prevent it. Li Yuhong suggested that it is necessary to strengthen cultivation management and increase organic fertilizers and phosphorus and potassium fertilizers. At the same time, pay attention to ventilation and dehumidification, reduce the humidity in the field, and maintain ventilation and light in the shed, timely removal of old leaves, diseased leaves. “At noon, the greenhouse was sealed for two hours, so that the temperature in the greenhouse reached 44°C-46°C, and it was conducted every 7 days. This can effectively kill the downy mildew,†said Li Yuhong.
For medication, Li Yuhong reminded growers that before the onset of rainy days, 2 kg of 5% chlorothalonil dust should be used for prevention. After onset, 58% metalaxyl MnZn wettable powder 400 times sprayed every 7-10 days. When the disease is severe, use 72% Ke Lu WP 500 times solution or 72.2% Promectazole WP 600 times solution.
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