黄脉病（见《现代农业》1997年12期封底彩照）是温室（大棚）黄瓜春夏季的多发病症。特别是近三年来表现为发病快、发病重，且没有有效的防治方法。针对这一情况，我们从1996年开始对该病进行了详细的观察研究提出了有效的防治方法。一、症状：黄脉病为全株发病，并且由下部向? Yellow vein disease (see “Modern Agriculture” 1997 the 12 cover color photos) is a greenhouse (greenhouse) cucumber spring and summer of multiple diseases. In particular, the past three years showed rapid onset, severe illness, and there is no effective prevention and treatment methods. In response to this situation, we started in 1996 a detailed observation of the disease proposed effective prevention and treatment methods. First, the symptoms: yellow vein disease for the whole plant, and from the lower to?