桂花叶子干尖是什么原因

植物图片 2021-06-03 08:54

桂花叶子干尖有多种原因：浇水过多导致的积水，光照和通风不足，湿度不足60%，温度小于15℃或大于28℃，其他病虫害导致的叶子干尖（褐斑病、枯斑病、炭疽病）。需要根据不同病因做出对应改善。

浇水问题

桂花的土要透气性好，而且怕涝。最好不干不浇，每次浇透。畏淹涝积水，若遇涝渍危害，则根系发黑腐烂，叶片先是叶尖焦枯，随后全叶枯黄脱落，进而导致全株死亡。

光照问题

桂花属于喜光植物，应适当安排桂花见光程度及见光时长。

湿度问题

在气温升高或干燥的环境下尽量采取了遮阳和喷雾的办法改善环境湿度。一般来说是老叶的尖干，只要增加湿度大60%以上即可好转。

温度问题

最适生长气温是15~28℃，温度偏低或者偏高都可能造成问题的产生。

通风问题

需要适时的增加通风。适宜栽植在通风透光的地方；喜欢洁净通风的环境，不耐烟尘危害。

施肥问题

平时要增加钾肥和腐殖肥，以提高其自身抗病能力。

病菌问题

褐斑病，发病初期，叶片上出现褪绿小黄斑点，逐渐扩展成近圆形病斑，褐斑病一般发生在4至10月份，老叶比嫩叶易感病。

枯斑病，该病病原菌多从叶缘、叶尖端侵入，发生在叶片的叶缘和叶尖。发病初期，叶片上产生淡褐色小点，逐步扩大成圆形或不规则形的病斑，后扩大为近圆形或不规则形灰褐色大斑，边缘为深褐色。枯斑病发生在7~11月份，在环境条件不好的棚室内全年可发生。

炭疽病，该病侵染桂花叶片。发病初期，叶片上出现褪绿小斑点，逐渐扩大后形成圆形、半圆形或椭圆形病斑。病斑浅褐色至灰白色，边缘有红褐色环圈。在潮湿的条件下，病斑上出现淡桃红色的黏孢子盘。炭疽病发生在4~6月份。

防治措施：首先要减少侵染来源。秋季彻底清除病落叶。盆栽的桂花要及时摘除病叶。其次加强栽培管理。选择肥沃、排水良好的土壤或基质栽植桂花；增施有机肥及钾肥；栽植密度要适宜，以便通风透光，降低叶面湿度减少病害的发生。科学使用药剂防治。

专题： 桂花
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