First, the characteristics of the occurrence of early planting dense planting, poor ventilation, partial nitrogen fertilizer, continuous disease incidence.
Second, prevention advice
1. Increase phosphate fertilizer and potash fertilizer and increase plant resistance to disease.
2. Dispose of the sick body in time, and concentrate deeply or burn it. After the rain, drain the drains in time.
3. In the early stage of onset, spraying 57.6% of the dry liquid granules of the crown bacterium 1000 times or 75% of the chlorothalonil wettable powder 600 times, once every 7 to 10 days, and continuously controlling 2-3 times.
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