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怎样预防白兰树苗木虫害

发布时间:2019-12-25 来源:luuvvs.com


  白兰树苗木北京11选5的叶子绿绿相间,花洁白如玉,香气如兰花。但往往由于管理不善,饱受病虫害之苦,导致叶片变黄,花朵不干净,影响观赏,令人失望。主要发生在叶片上。初期表现为黄化,出现小黄斑,然后逐渐扩展成圆形或椭圆形。几个病斑合并成不规则的斑点,中心为浅棕色,边缘为深棕色。病变发生在叶片边缘时呈半圆形,使叶片有些扭曲。病情严重时,整片叶子都被烧焦变黑。

怎样预防白兰树苗木虫害

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