北京黄瓜的品种很多,大致可以分为刺黄瓜、鞭瓜、截头黄瓜和苏联黄瓜等四种类型,其中以北京大刺黄瓜的采收期较早,品质也最好。但北京大剌黄瓜最易感染严重的霜霉病(即露菌病,俗称跑马干)。通常于3月下旬在阳畦内播种育苗,4月下旬定植于露地,5月20日前后开始采收,6月下旬植株就因病害而死亡。采收期约30—40日,每亩产量3,000—5,000斤,病害严重时祇能收1,000斤左右。为提高单位面积产 There are many varieties of cucumbers in Beijing, which can be divided into four types: cucumber, bourgeon, truncated cucumber and cucumber of the Soviet Union. Among them, cucumber of Beijing has the earlier harvested period and the best quality. But Beijing assassination cucumber most susceptible to severe downy mildew (ie, dermabrasion, commonly known as running dry). Seedlings are usually planted in the Yangli by the end of March, planted in the open field in late April, and harvested before and after May 20. In late June, the plant died of disease. Harvest period of about 30-40 days, yield 3,000-5,000 pounds per mu, serious disease can only receive about 1,000 pounds. To increase unit area production