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经7年的观察试验,张家口地区葡萄霜霉病发病高峰在8月中旬,葡萄植株幼嫩部分比成龄部分发病严重。摘除7月15日以后发出的副梢,结合两次喷药,保护成龄叶片,可有效控制该病的发生。
After seven years of observation and test, the peak incidence of grape downy mildew in Zhangjiakou region in mid-August, grapes young part of the incidence of serious than the aging part. Removal of secondary shoots issued after July 15, combined with two spray, protect the aging leaves, which can effectively control the occurrence of the disease.