看叶相辨别棚室黄瓜十大病害一、氮肥过多症植株暗绿色，下层叶萎蔫卷曲，叶柄下垂，叶脉间出现干纸状黄色斑，在叶缘处连成一片，严重时干缩死亡。二、缺磷病叶脉间出现大块水浸状斑，自下而上向幼叶扩展，不几天大块病斑干枯，叶皱缩，植株生长受抑制。三、缺钾病叶缩小... First, the nitrogen fertilizer overdose plant dark green, the lower leaves wilted curly, petiole drooping, dry yellowish yellow spots between the veins, even in the leaf margin at the same time, severe dry shrink death . Second, the lack of Phosphorus disease between the large patches of flooding plaques, bottom to the expansion of young leaves, a few days a large spot dry, leaf shrinkage, plant growth was inhibited. Third, potassium deficiency disease leaves shrink ...