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嫁接黄瓜苗定植后为啥频死棵?全解析来了

放大字体  缩小字体 发布日期:2018-06-16  来源:安信种苗官网  作者:青桐  浏览次数:50
核心提示:黄瓜嫁接苗拥有抗病(枯黄萎病、根腐病等)、抗逆(涝、旱、寒、热等)、增产(因砧木根系发达,长势强)等优势。然而,近几年,却有不少种植户会有这样的疑问:为何我的黄瓜嫁接苗定植后照样会有死棵现象的发生?
       黄瓜嫁接苗拥有抗病(枯黄萎病、根腐病等)、抗逆(涝、旱、寒、热等)、增产(因砧木根系发达,长势强)等优势。然而,近几年,却有不少种植户会有这样的疑问:为何我的黄瓜嫁接苗定植后照样会有死棵现象的发生?

      原因一:与砧木抗性不良有关

      如果嫁接砧木抗性不良,便会降低嫁接的意义。建议广大种植户朋友,能根据自己的土壤状况、栽培茬口等条件来选择优良的抗性砧木。

黄瓜2

      原因二:与嫁接措施不力有关

      实践证明,砧木与接穗的亲和性、质量、苗龄以及嫁接技术、环境条件、嫁接后管理,都是影响嫁接成活的重要因素。

      1、砧木苗龄过大,中空导致长根

      在嫁接时,一定要注意砧木苗龄不能过大,只要砧木真叶长到5分钱大小就应该进行嫁接。

      2、忽视了嫁接口的保护

      黄瓜嫁接苗定植时一定要轻拿轻放,以免嫁接口开裂。注意不要让土壤埋没嫁接口,土壤埋没嫁接口后,一是容易感染土传病害;二是接穗上容易生出不定根,影响嫁接效果。

      原因三:与伤根致病有关
      黄瓜嫁接苗死棵,多与伤根致病有关。而导致伤根致病的情况比较多,如沤根、烧根、重茬障碍、盐害、气害、致病菌等。为了增加土壤肥力,未经充分腐熟的肥料直接施入大棚,为气害发生埋下了危险的种子。病害造成的死棵多为砧木茎基部坏死而导致的,多为细菌性软腐病、疫霉菌根腐病和茎基腐病发生导致。棚室病原菌的大量存在,再加上嫁接苗定植后高温高湿或低温高湿的环境,为上述三种病害的发生创造了有利条件,最终导致黄瓜嫁接苗死棵。

 
 
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