Hazardous symptoms and time of occurrence: mainly harm the leaves, but also harm the new shoots, petioles, inflorescences, stalks and young fruit. Downy mildew generally begins to occur in July, and gradually increases in mid-July and late July. It is a period of high incidence from August to September.
Key prevention period: From the beginning of June to the pre-mature period before and after each rainfall, it is the critical period for controlling downy mildew. From July to September, it is the key prevention period.
Control agent: 600% of 70% Baoye Zinc Zinc and 80% of Baoyexin Manganese 600 times. After each rain, 200 times of Wangquan, 72% of methane Mn-Zn, and 800 times of 10% Dimethomorph were alternately used. Before the rain can be used interchangeably.
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