近十年来,北京地区葡萄霜霉病的发生为害,有时比较严重。给京郊不少葡萄园带来较大的损失。例如我单位的2,610亩葡萄,1973年有90%以上的植株发生了霜霉病,葡萄叶片也早期脱落,大多数果粒不能成熟,果粒掉落很严重,当年总产量只有153万斤,减产40%多。 In the recent ten years, the occurrence of grape downy mildew in Beijing is harmful and sometimes serious. To the suburbs of many vineyards bring greater losses. For example, there are 2,610 mu of grapes in my unit. Downy mildew occurred in more than 90% of the plants in 1973, and grape leaves also dropped off early. Most of the fruit grains did not mature and the fruit drop was very serious. In that year, the total output was only 1.53 million kg, Cut more than 40%.