Spinach disease is relatively rare in autumn and winter, but prevention and control of spinach downy mildew is essential.
Symptoms Downy mildew usually begins with the lower leaves and begins to develop light green water-stained spots. The edges of the lesions are not obvious, and late-stage disease develops irregular yellow spots. When the humidity is high, the gray and white mold layer appears on the back of the leaves. Become dark gray. In the shed, the diseased leaves gradually turn yellow and dry when the drought occurs, and when the air humidity is high, the diseased leaves become rotten.
The occurrence of downy mildew is a fungal disease caused by an oomycete. The temperature is low, the air is wet or the field humidity is high, the planting is too dense, and the downy mildew is easily induced when the air and light transmission between the rows is poor. In general, the replanted plots and watersheds are too heavy and the disease is heavy.
Preventive measures Agricultural control. First, it takes 2-3 year rotation for serious disease fields. Apply sufficient organic fertilizer to improve the disease resistance of plants. The second is the rational close planting, scientific watering, flood prevention to prevent flooding, to prevent the spread of disease and water. Increase ventilation and reduce humidity. Third, if a diseased plant infected with Downy mildew is found, it must be removed in a timely manner and brought out of the field to be burnt or buried. At the same time, lime is used to treat the planting holes to prevent the spread of the disease. At the time of harvest, the stubble leaves are completely removed and taken out of the field to be buried or burned.
Chemical control. It can be sprayed with 75% chlorothalonil wettable powder 500 times in the early stage of the disease. When the disease is severe, it can be sprayed with 58% methasone zinc wettable powder 500 times or 69% zinc methacrylate zinc wettable powder 800 times. Spray once every 7 days, continuous control of 2 or 3 times, can effectively control the spread of downy mildew. At the same time, it can be combined with sprayed foliar fertilizers and plant growth regulators for better control.
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