杜鹃黄化病是一种生理性病害。发病后,笔者曾采用硫酸亚铁水溶液喷叶、浇施酸性肥水等措施进行整治,但却很少见效,甚至适得其反,故有人称其为“不治之症”。但有一些杜鹃黄化病株不采取任何措施,听其自然,倒反而能慢慢恢复生机,不治而愈,这是什么原因呢? 笔者经几年的实际观察发现,盆土偏碱、缺铁固然是发病的原因,但是在土也酸、水也酸、土壤含铁量并不缺乏的南方,因缺铁和碱化而引起的黄化病并不多见。因而笔者认为,常见的杜鹃黄化病并不是单纯地缺乏某种元素,而是由于管理不当导致植株生理机能发生障碍所致。其中主要是由于肥水偏多,伤害了根系;其次,开 Cucumber yellow disease is a physiological disease. After the onset, I used to spray the leaves of ferrous sulfate solution, pouring acid fertilizer and other measures for water treatment, but rarely effective, or even counterproductive, it was called “incurable disease.” However, some cucumber rhizome disease does not take any measures to listen to its natural, but can slowly restore vitality, and cure, what is the reason? The author after several years of actual observation found that basin soil alkaline, iron deficiency, of course Is the cause of the disease, but in the soil is also acid, water is also acid, soil iron content is not lacking in the South, due to iron deficiency and alkalization caused by yellowing disease is rare. Therefore, I believe that the common cuckoo disease is not simply lack of a certain element, but due to improper management of plant physiological function caused by obstacles. Which is mainly due to more fertilizer and water, hurt the roots; secondly, open