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兰花叶子有黑斑怎么办
更新时间: 2020-10-21 00:00:00  

兰花叶子有黑斑,说明是得了炭疽病。炭疽病发病初期在叶上出现黑褐色病斑,周边有褪绿色晕。病斑扩大后呈椭圆形或长条状。后期病斑上出现黑色粒状物。

防治方法要注意通风透光;合理施肥,提高抗病力,于生长期控制氮肥的施用,适当多施磷钾肥;发病初期喷洒50%多菌灵或70%托布津可湿性粉剂500到800倍液。

关键词: 兰花 叶子 黑斑 怎么办

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