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栀子花叶子发黑
更新时间: 2020-07-06 00:00:00  

栀子花叶子发黑是因为栀子花得了炭疽病。

症状: 该病主要危害栀子花的叶片。病害多从植株下部叶片开始发生,被侵染的叶片上形成褐色圆形小斑,整个叶片逐渐变黄并脱落。病害也可从叶尖、叶缘处发生,形成不规则形的褐色病斑,整个叶处逐渐变褐色、质硬并脱落。病害严重的植株可大量落叶,并导致枝条甚至枯死。在潮湿的条件下,叶两面病斑上均产生小黑点,以叶背面小黑点为多。

病原及发病现状:该病为真菌性病害,是由围小丛壳菌侵染所致。病菌主要以菌丝体潜伏在地越冬,第二年春季温湿度适宜时形成分生孢子进行

关键词: 栀子 叶子 发黑

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