怎样防治枯萎病

植物图片 2020-01-03 21:23

患枯萎病的茄子

枯萎病为病毒性病害，受害株无挽回余地。主要危害香石竹、菊花、翠菊、唐菖蒲、石竹、紫罗兰等花卉。病毒侵染根系，进而侵入维管束系统，引起地上部出现症状。初期植株一侧叶子失绿变黄，最后全株叶子变褐，萎蔫枯死。受害组织切面，可见维管束组织变成褐色。

防治方法：①发现病株应立即拔除销毁，并用25{bf}苯来特或50{bf}多菌灵可湿性粉剂200～400倍液淋灌病株穴土；②发病严重的花圃要用氯化苫等进行土壤消毒。盆栽应每年更换1次新的无菌营养土；③采用抗病品种；④繁殖时要从无病植株上采摘插条，移栽时要注意避免伤根，使用的基肥要充分腐熟。

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