Answer: This is a cucumber suffering from downy mildew. This disease is the main disease of greenhouse cucumber in winter and spring. It should be timely according to the humidity and temperature conditions required by greenhouse vegetable, ventilation and ventilation. Spray with 5% chlorothalonil powder, or spray with 64% antimony wettable powder 400 times, or 70% metonate aluminum wettable powder 250 times.
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