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兰花的叶子有些发黑怎么办
更新时间: 2020-08-18 00:00:00  

兰花叶子发黑是因为有炭疽病;

处理方法为:

1、对已患炭疽病的兰叶忍痛割爱,剪去病叶;并用叶斑青乳油浸泡兰根2到3小时;

2、通风,剪除发病部分喷800到1000倍多菌灵稀释液;

3、用鼓风机或电风扇定时吹风,低毒高效,停止喷水和浇水,争取把空气相对湿度控制在70%到80%;

4、应尽量减少叶面喷水和兰盆浇水次数。

关键词: 兰花 叶子 有些 发黑 怎么办

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