常春藤叶子发黄的原因及处理办法

植物图片 2019-12-17 10:21

常春藤要求温暖多湿的环境，在生长期要保证供水，经常保持盆土湿润，防止完全干燥，若水分不足，会引起落叶。下面为大家具体介绍一下常春藤叶子发黄的原因及处理办法：

常春藤

常春藤叶子发黄分析

1、浇水过多，盆土长期过湿，造成土中缺氧，使部分须根腐烂，阻碍正常呼吸和水分养分的吸收，引起叶子变黄脱落。受害后先是嫩叶变成淡黄色，继而老叶也渐渐发黄。

解决办法：应立即控制浇水，暂停施肥，并经常松土，使土壤通气良好。

2、干旱脱水，养花漏浇水或长期浇半腰水(即上湿下干)，影响养分吸收，也易引起叶色暗淡无光泽，叶子萎蔫下垂。先是下部老叶老化，并逐渐由下向上枯黄脱落。

解决办法：此时需少量浇水并喷水，使其逐渐复原后再转入正常浇水。平时在空气干燥的情况下，应经常向叶面和周围地面喷水，以提高空气湿度。

3、长久脱肥，长期没有施氨肥或未换盆换土，土中氮素等营养元素缺乏，造成枝叶瘦弱，叶薄而黄。

解决办法：需及时倒盆，换入新的疏松肥沃的营养土逐渐增施稀薄腐熟液肥或复合花肥。

4、施肥过量，施肥过多就会出现新叶肥厚，且多凹凸不平，老叶干尖焦黄脱落。

解决办法：应立即停止施肥，增加浇水量，使肥料从盆底排水孔流出，或立即倒盆，用水冲洗土坨后再重新栽入盆内。

5、炎热高温，夏天若将性喜凉爽的花卉摆在高温处让强光直晒，极易引起幼叶叶尖和叶缘枯焦，或叶黄脱落。

解决办法：需及时移至通风良好的阴凉处。

6、蔽荫过度，若将喜阳光的花卉长期摆在蔽荫处或光线不足的地方，就会造成枝叶发黄。

7、水土偏碱，北方多数地域土壤及水中含盐碱较多，栽植喜酸性土花卉，如杜鹃、山茶、含笑、栀子花、兰花、白兰、桂花等，由于土中缺乏可被其吸收的可溶性铁等元素，叶子就会逐渐变黄。

解决办法：栽植时要采用酸性土，生长期间经常浇矾肥水。

8、密不通风，若施氮肥过多，枝叶长得进于茂盛，加上长期未修剪，致使内膛枝叶光线不足，容易引起叶子发黄脱落。

解决办法：应合理施肥并加强修剪，使之通风透光。

9、空气干燥，室内空气过分干燥时，一些喜湿润环境的花卉，如吊兰、兰花等往往会出现叶尖干枯或叶缘焦枯等现象。

解决办法：应注意采取喷水、套塑料薄膜罩等法增加空气湿度，

10、气温不当，冬天室温过低，对于性喜高温花卉常易受到寒害，因而造成叶子发黄，严重时枯黄而死。若室温过高，植株蒸腾作用过盛，根部水分养分供不应求，也会使叶子变黄。

解决办法：应请注意及时调整室温。

11、病虫为害，受到真菌等病菌侵害引起的叶斑病，易使叶子局部坏死，出现黄色斑点或斑块，严重时整叶枯黄脱落，受到花叶病毒侵染后叶子上出现黄绿相嵌的斑驳；遭受介壳虫、红蜘蛛等为害，叶子也会变成局部黄枯，甚至整叶萎黄脱落。

解决办法：应及时喷药防治。

12、强性刺激，防治病虫害时使用农药浓度过大，或者受到大气中有毒气体污染，或者气温高时骤然浇灌冷水等，均易引起叶尖或叶面局部发黄焦枯，甚至全株枯死。

解决办法：应注意合理使用农药，设法排除空气污染源。

总结：盆花黄叶有时是一种原因引起的，但往往是由于多种因素造成的，应作出正确诊断，方能对症下药。

专题： 常春藤
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