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洋葱霜霉病(Peronospora destuctor Casp)是酒泉地区洋葱的主要病害。年发生面积约占播种面积的80％左右,七月下旬至八月初(正常收获前
Onion downy mildew (Peronospora destuctor Casp) is the main disease of onion in Jiuquan area. Annual occurrence of about sown area of about 80% of the area, late July to early August (before normal harvest