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霜霉病是保护地和露地黄瓜最严重的流行性病害,在不同年份、不同管理水平及不同品种上发病轻重不同,在黄瓜的整个生育期均可发
Downy mildew is the most serious epidemic disease in protected and open field cucumbers. In different years, different levels of management and different varieties of different severity of disease, can be made throughout the growth of cucumber