龟背竹叶子发黄的病因和处理方法

植物图片 2019-11-01 10:18

龟背竹欣赏

龟背竹是的盆栽观叶植物，其株形优美，叶子形状奇特，叶色浓绿，且富有光泽，不过，若养护不得当，极易发生黄叶现象，影响观赏价值，严重的还会影响龟背竹的生长。如遇到叶子发黄现象该如何处理呢？下面我们就来学习这方面的小知识吧。

龟背竹叶子发黄及解决办法

叶子发黄的龟背竹

通常情况下把变黄的叶子剪掉，换盆土后置于通风有散射光处，保持一定的环境湿度，龟背竹就会重新萌发新叶。具体原因与解决办法如下：

1、土壤

原因分析：龟背竹的根系为肉质根，对土壤的疏松透气性要求较高。若土壤透气性不好或长时间不换土，就有可能会引起土壤板结，影响龟背竹的呼吸作用，从而使龟背竹生长不良，叶子变黄；

解决办法：适度地给龟背竹松土或换盆土；

2、气温

原因分析：龟背竹的生长适温20～25℃，冬天夜间气温幼苗期低于10℃或成熟植株低于5℃易发生冻害，均可引起叶子变黄；

解决办法：冬天需对龟背竹的根部进行适度保暖，以增强植株的抗寒能力。但不要把龟背竹直接摆在暖气炉或空调旁边；

3、肥料

原因分析：铁是植物合成叶绿素所必须的原料，如果土壤或肥料中铁元素不足，就会影响龟背竹合成叶绿素，从而引起叶子失绿变黄；

解决办法：每隔几天适量施用矾肥水或喷施0.1～0.3％硫酸亚铁溶液；

4、光照

原因分析：龟背竹耐阴，但是长期将龟背竹放置在荫蔽环境下，会影响光合作用，而使叶子变黄。夏天在强光暴晒下也会引起龟背竹的叶子灼伤而变黄；

解决办法：不要长期将龟背竹放置在荫蔽环境下，适时给龟背竹晒些散射光，夏天要注意遮阴，避免阳光暴晒；

5、浇水

原因分析：浇水过多会引起龟背竹的烂根现象，过少会使植株缺水而生长不良，这两种情况都会引起龟背竹的黄叶现象；

解决办法：浇水应掌握宁湿不干的原则，经常保持盆土潮湿，但不积水，春秋天每2～3天浇水1次。盛夏天节除每天浇水外，需喷水多次，以保持叶面清新。冬天叶子蒸发量减弱，浇水量要减少；

6、通风

原因分析：通风不好时会引起龟背竹叶子的闷黄；

解决办法：保持室内通风良好，也可以将龟背竹白天放到室内观赏，晚上搬到室外；

7、病害

原因分析：龟背竹灰斑病又名叶枯病，为龟背竹的常见病害。发病严重时，能引起叶子枯死；

解决办法：及时防治害虫，剪除病叶或叶子的病组织，集中销毁。药剂防治可喷洒0.5{bf}波尔多液或50{bf}退菌特1000倍液。

专题： 龟背竹
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