黄瓜叶烧病是近年来保护地新出现的生理病害。多发生在植株中上部叶片上，以接近或接触棚膜的叶片易发生。发病初期病部的叶绿素明显减少，在叶面上出现小的白色斑块，形状不规则或呈多角形，扩大后呈白色至黄白色斑块，轻者仅叶缘烧焦，重者致大半叶片乃至全叶烧伤。黄瓜... Cucumber leaf fever is a newly emerged physiological disease in recent years. Occurred in the upper leaves of plants in order to close or contact with the greenhouse film leaves prone. In the early stage of disease, the chlorophyll of the diseased part obviously decreased, small white plaques appeared on the foliage, the shape was irregular or polygonal, white to yellowish-white plaque enlarged after the enlargement, Leaves and whole leaf burns. cucumber...