Watering should be reasonable, avoid flooding with large water, small water should be watered, watering should be controlled, and shallow water small border irrigation. Combined with watering, copper sulfate can be used to irrigate the roots. It is recommended to mix 1-2 kg of copper sulfate with fine sand on the ground per acre, and then lightly water.
It can be prevented by spraying. It is recommended to use thifluzamide + mancozeb, or dimethomorph + pyraclostrobin + thifluzamide once every 5-7 days, and spray 2-3 times.
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