桂花发芽叶尖变黑怎么办：叶芽尖发黑是桂花叶枯病所至

植物图片 2019-08-23 13:35

桂花树，自古就深受中国人的喜爱，桂花被视为十大传统名花之一，桂花树是集绿化、美化、香化于一体的观赏与实用兼备的优良园林树种，桂花清可绝尘，浓能远溢，适合全国多个地域栽培。最近听到不少花友反映自家的桂花树新长得叶芽尖发黑，不知道怎么办。小编通过在网上查找资料，终于找到原因了。

桂花发芽叶尖变黑

桂花发芽叶尖变黑原因分析及解决办法

一、桂花叶芽尖发黑的原因：

由桂花叶枯病所至；

桂花叶枯病是一种发生在桂花叶子上的植物疾病。该病通常发生于桂花叶子的叶缘、叶尖，它能使全叶便干枯三分之一到一半，然后使叶子整个坏死脱落。 　　

二、桂花叶枯病传播途径 ：　　

病菌以菌丝或分生孢子器在病叶、病落叶中越冬，分生孢子借风雨传播。病菌发育最适气温为27℃左右。盆栽场所潮湿闷热、通风不良时，或植株生长衰弱时都会病重。病害在经冬后的老叶上发生较多。植株下部叶子发生较多。

三、防治方法：

1、减少侵染来源。 　　

病株要及时摘除病叶，以阻断侵染来源。秋天彻底清除病落叶。盆栽的桂花要及时摘除病叶。 　　

2、加强栽培管理。 　　

选择肥沃、排水良好的土壤或基质栽植桂花；增施有机肥料及钾肥；栽植密度要适合，以便通风透光，降低叶面湿度减少病害的发生。 　　

3、科学使用药剂防治。 　　

发病初期喷洒1：2：200倍的波尔多液，以后可喷50％多菌灵可湿性粉剂1000倍液或50％苯来特可湿性粉剂1000至1500倍液。重病区在苗木出圃时要用1000倍的高锰酸钾溶液浸泡消毒。

专题： 桂花
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