米兰叶子上长白斑凸起怎么办

植物图片 2021-02-28 09:03

米兰叶子上长白斑凸起，是由于它患上了藻斑病，这种病往往是通风不好导致的。发病后需要在第一时间剪除并烧毁病叶，并将它放到空气流通好的地方，适当降低空气湿度。初期可以用波尔多液防治。平时还要加强水肥管理，降低患病的可能。

一、剪除病叶

米兰叶子上的白斑是病菌，会产生孢子传播感染。所以对于患病的枝叶要第一时间剪除，最好进行烧毁。避免病菌的残留，导致二次复发。

二、通风降湿

藻斑病的主要原因是通风不畅。在室内养殖的米兰最容易发生，所以要加强空气流通。首先是更换生长环境，将它放在阳台或窗台，避免和其他植株挨得太近。其次是修剪过密的枝叶，保证其内部的通风良好。同时潮湿也是病菌寄生的关键，需要适当的松土，或在室内放干燥剂，降低一下湿度。

三、药物防治

在白斑出现的前期，可以用波尔多液或石硫合剂进行防治。药物喷洒有一定的局限性，一般只能喷洒到看到的白斑，但有一些传播的微小病菌是看不到的。病情严重的话，只是治标不治本，还会二次复发。

四、水肥控制

在平时浇水时应注意不要让土壤过于潮湿，这会引起病菌的滋生。同时施肥也要均衡，有机肥可以有效提升植株的抗病力。不要偏施磷肥，只关注它的开花，而忽视其健康。

专题： 米兰
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