Recently, many vegetable farmers have reflected on the recurrence of cucumber powdery mildew in the greenhouse. They are now explaining the symptoms and causes of powdery mildew and helping farmers to prevent and treat the disease in a timely manner.
First, the symptoms. Cucumber powdery mildew, commonly known as "white disease", is the most severely affected by the leaves. In the early stage of disease, white or nearly circular small spots appear on the front or back of leaves, as if a layer of white powder has been scattered.
Second, why repeated attacks. 1. Powdery mildew has the characteristic of "suddenly getting wet and damp", because dry air is conducive to spore transmission, and moist air is conducive to spore infestation. 2. The spores of the powdery mildew drift and stick to the walls and brackets, allowing them to drift to the invading hazards of cucumber leaves at any time. 3. Only fight drugs when the disease is serious, and the control is not thorough.
Third, how to prevent and cure. 1. The greenhouse before the planting is fumigated with sulfur powder. The spores of the powdery mildew are scattered and adhered to the wall brackets. The powdery mildew is particularly sensitive to "sulfur" and can be fumigated in the environment. Every 55 cubic meters of sulfur powder 0.13 kg, sawdust 0.25 kg, into the pot, divided into several places, in the evening under the conditions of confined lighting fumigation. 2. Shelters should try to avoid the situation of the environment being dry and damp. 3. In the early stage of disease, it is necessary to fight drugs in time and pay attention to alternate medication. 4. Select 50% sulfur suspension 500 times, 75% chlorothalonil 600 times, 40% Fuxing Emulsion 6000 to 8000 times, 10% World High Water Dispersible Granule 2000~3000 times, 25% nitrile Mycozal EC 5000-6000 times, 50% thiophanate WP 1000 times, spray control, continuous 3 to 4 times.
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