Prevention and control methods: spray 600 times of 75% chlorothalonil wettable powder, or 1000 times of 70% thiophanate methyl wettable powder, or 500 times of 40% chlorothalonil suspending agent, or 1000 times of 75% chlorothalonil wettable powder, or 1000 times of 70% methyl thiophanate. Or 1000 times of 75% chlorothalonil wettable powder and 1000 times of mancozeb wettable powder, or 800 times of 50% compound thiophanate-methyl wettable powder, or 1000 times of 50% benomyl wettable powder, or 800 times of 50% thiophanate-methyl sulfur suspension.

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