观叶植物生长不良都有哪些表现

植物图片 2019-12-02 21:35

发财树叶子发黄

观叶植物生长不良大多属于生理性病害，是由环境条件不适等原因引起的，比如气温过高、光照过强等。完全不同于因病毒、病菌或昆虫等因素造成的病害。通常表现在以下几个方面：

1、短期内突然的落叶常常是由于气温变化幅度太大或光照过强而引起的。

2、叶子变黄，不久脱落大多是由于浇水过多所致。在寒冷的冬天，如室内气温过低，有些怕冷的观叶植物如广东万年青等，叶子也会变黄，甚至脱落。

3、叶子干尖或叶子边缘枯焦有时是光照过强的缘故，有时是因施肥过量或盆土干燥引起的。另外，室内的空气干燥常常是引起干尖的主要原因。

4、枝叶徒长主要是由于光照过强、施肥不当引起，应把植株转移到光线适度处修剪整形，并适度施肥，再促进其继续生长。浇水过多，也会引起枝叶徒长。

5、叶子上出现的像水渍一样的黄斑或棕色斑，除去非生理性病害的因素外，就是浇水过猛、泥点飞溅的后果。对于某些种类，如紫绒三七、非洲紫罗兰等，它们的叶面上覆有浓密的绒毛，如果直接在叶子上浇水，很容易存留水珠，而使叶子变黄至腐烂。

专题： 观叶植物
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