兰花叶尖干枯的原因
兰花叶尖干枯的原因,盆栽兰花经常发生叶尖干枯,甚至整叶枯萎,主要原因是兰花炭疽病和圆斑病造成的。这种病在梅雨季节或夏秋之交高温多雨时大量发生,可以在易发病期喷洒50%多菌灵1 000倍液或50%克菌丹500倍液,10天1次,连喷3~4次做预防。家庭可以购买小包装灭菌农药。
兰花的叶尖干枯不都是由病虫害引起的。兰花缺钙或肥料过多,也会引起叶尖变黄,然后褐色而干枯,像卡特兰、树兰、万代兰和国兰都有这种现象。
另外,兰花遭受冻害或晚霜危害时,也容易形成叶尖干枯或变色。因此,冬季气温在O。C以下的地区,入冬前,要把兰花移置于室内通风和有阳光处养护。春天移置室外时,要注意避免晚霜危害。
发生的叶尖干枯现象不太严重时,可采用人工剪除的办法,用剪刀(最好用酒精消毒过的)按“八”形在干枯部分以下10毫米左右处剪去,仍然可以保持满盆绿色,若修剪后再喷上述杀菌剂那就更好了,以上就就是关于兰花叶尖干枯的原因的介绍。
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