天竺葵夏季黄叶的原因分析及附图

植物图片 2019-09-18 09:46

天竺葵是一种很常见且很受欢迎的观赏花卉，但是在夏天栽植种的过程中常常会出现黄叶的现象，这让很多花友很苦恼，既找不到什么原因，也无从下手。因此，小编特意整理了相关资料，希望能对您有所帮助！

天竺葵夏天黄叶的原因

天竺葵夏天黄叶的原因：

小编认为，天竺葵夏天黄叶主要有以下几种情况：

1、换环境引起的老叶发黄。很多花友会在夏天高温来临之前，将小天由室外的花架上移入室内，或由南阳台移到北阳台，或由全日照的室外移到走廊，或给花花搭上遮阳网等，生长环境突然出现大的改变，会引起天竺葵的老叶发黄、花苞干枯的现象。大家不必过份担心，小天有个适应新环境的过程，只需要掐掉发黄的大叶子、干枯的花苞就可以了，其他正常管理。

2、高温引起的新叶发黄。这是由于夏天气温过高，影响根系正常从土壤中吸收铁元素，造成的新长的叶子出现高温性、缺铁性黄叶、白叶。缺铁轻微时嫩叶叶肉组织呈淡绿色，叶脉保持绿色;严重时嫩叶全部呈黄白色，并出现枯斑而逐渐焦枯脱落。这种情况也不必过于担忧，可以喷施和浇灌螯合铁溶液。一周一次，3次后可基本恢复正常。另外，降低环境气温，如移到通风阴凉的地方或空调房间，叶子也会慢慢恢复正常。

由于高温引起的新叶发黄现象

新叶发黄、发白现象比较严重，有的叶子已出现枯斑

3、盆土干旱引起的黄叶。有些花友可能会误解有关天竺葵夏天适度控水的问题，所以让盆土完全干透很久才浇水，造成天竺葵叶子自下而上变黄脱落，严重时叶柄下垂呈萎蔫状。这种情况就需要调整浇水方法，运用干湿交替的原则来给小天浇水。

4、盆土过涝引起的黄叶。由于浇水过勤、过多，盆土长期过湿，加上气温偏高，引起天竺部分根系腐烂，表现在叶子上就是老叶无明显变化、嫩叶变成淡黄色。严重的老叶也会出现黄叶脱落现象。这就需要立即控水，疏松盆土摆在通风干燥处，加快蒸发水分。或将花盆摆在一沓报纸或干泥炭上，让报纸和泥炭把盆中过多的水份尽快吸出。情况特别严重的，可整个土块从盆中脱出，置于干泥炭或土堆中，使水分迅速渗出，待下垂的枝叶复原后再重新栽入盆中。

5、因营养不足引起的饿黄。天竺葵开花勤奋，而开花会消耗大量营养。春天是小天的盛花期，它们不遗余力地尽情绽放，带给花友们很多快乐和欣喜，如果我们没有及时进行适度的追肥，花后就会出现黄叶的现象。主要特征为花后所有叶子整体变色，新芽不出或者新叶小而薄而且发育慢，茎的直径明显变细。这种情况要先淡后浓逐步加大施肥浓度进行追肥，防止一次施肥过量造成烧苗，直至叶子的颜色恢复正常后按照常规施肥。为了防止这种情况出现，我们一是可以在花期、花后适度追肥，促进小天在盛夏酷暑前积累够足够的营养，二是可以在夏天摘除花蕾，以保证小天有足够的体力抵抗酷暑，安然度夏。

上图左侧就是两拨花后出现的缺肥性黄叶现象

6、因施肥过勤或浓度过高引起肥黄。施肥过勤或浓度过高，会引起烧根、烂根现象，反应在叶子上就是老叶发黄，幼叶肥厚，有光泽，且凹凸不平。这时就需要控肥、中耕、浇水。肥害严重的则应立即倒盆，去掉部分陈土，并用水洗冲土坨，换上没有肥料的素土，重新发根。

7、生理性黄叶。如移栽后由于一时营养失调，出现少量黄叶脱落;处于植株内侧的叶子因光照不足形成的变黄脱落，萌发新枝叶后老叶萎黄，垂天水大引起的水肿病及叶子发黄，及其盆花的环境发生巨大变化(比如盛夏由室外突然搬至室内或者冬天刚入室)等，都属于生理性黄叶现象。由于发黄的叶子也希望自己能尽快恢复生机，会吸收植株本身积累的营养，它消耗的营养大于其制造的营养。所以我们不必过于担心，只需及时摘除黄叶即可。

天竺葵生理性黄叶

8、病虫害引起的黄叶。天竺葵如果受真菌、病毒等病原物侵染，便会引起多种叶斑病、灰霉病，使叶子局部组织坏死，出现失绿黄斑或黄绿相嵌的斑驳，或整叶变黄脱落。受到红蜘蛛、白飞虱等害虫为害，叶绿素受到破坏，叶子也出现黄白色小斑点，或叶色变黄脱落。这就需要依据病虫害原因及时喷药防治了。

专题： 天竺葵
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