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防治君子兰烂根病应该这样做

樊问
2017-04-25
#君子兰 烂根病一年四季都可能发生,以夏季发病较严重。有的人为了美观,将君子兰养在瓷盆、塑料盆或紫砂盆这些透气、透水性差的花盆里。由于这些花盆的渗透性差,空气流通困难,根的呼吸受阻,夏季浇水后易造成烂根。有的人虽将君子兰栽于泥盆,但唯恐其缺水、缺肥,见盆表土干就浇水,并常施浓肥。在根呼吸窒息、浓肥烧根,加上夏季某些有害细菌繁殖快的情况下,便造成烂根。     



君子兰适宜的生长温度为5℃~25℃。在高温高湿的夏季,除采取遮阴、通风、降温等措施外,还应控制其生长,加强其根的养护。

主要方法:
一是养君子兰要用泥盆;

二是夏季不施肥或少施肥;

三是夏季控制浇水,坚持不干透不浇水的原则。为防止夏季水大闷根,可用大木箱盛湿锯末将花盆埋入(盆内不浇水),之后经常检查,见锯末干时再补充喷水。     

如果不慎发生君子兰烂根,要及时进行抢救。即先把烂根君子兰从盆内磕出,去土,用清水洗根后,再用高锰酸钾水溶液涂抹烂根处,然后,用白纸包裹全部叶片,只露出根部,让根部在阳光下晒半小时,利用紫外线杀死病菌。经过以上方法处理,如果病株只有少数根烂掉,可直接栽到经过消毒的营养土中,前半月少浇水,一个半月可恢复生长;若病株半数以上的根烂掉或全部烂掉,则应将其栽在盛细沙的盆中,置于阴凉处萌生新根,约两个月新根长出后,更换营养土,即可进行正常管理。
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