铁皮石斛白绢病发生规律研究

Occurrence regularity of Dendrobium catenatum southern blight disease

为了科学防控铁皮石斛白绢病,对引起病害的病原Sclerotium delphinii、环境因子(温度、湿度)、铁皮石斛种质与白绢病发生的关系进行研究,结果表明同时满足温度25～30℃与湿度95%以上是铁皮石斛白绢病发生与流行的主要条件,白绢病病株与带菌基质是病害传播的源头,及时清除病株,更换带病基质,保持空气流通,降低空气湿度是防控铁皮石斛白绢病发生与流行的有效手段;铁皮石斛种质对白绢病抗性存在明显的差异。研究结果为铁皮石斛抗病品种选育及进一步深入解析白绢病病害感染和抗性机制提供了重要基础。

In order to scientifically prevent and control Dendrobium catenatum southern blight disease,the main factors related to this disease occurrence,the pathogen( Sclerotium delphinii),environmental factors( temperature and humidity) and D. catenatum germplasms,were investigated. The results showed that reaching 25-30 ℃ temperature and over 95% humidity simultaneously should be the main conditions for the occurrence and prevalence of D. catenatum southern blight disease. Moreover,the S. delphinii-infected plants and their contaminated substrates were the disease spreading sources. Therefore,removing the infected plants,dealing with the contaminated substrates,keeping air ventilation,and reducing air humidity are the effective ways to prevent and control the occurrence and prevalence of D. catenatum southern blight disease. The research also indicated that D. catenatum has different resistances to the southern blight disease depending on germplasm. The present study lays important foundations for the breeding of D. catenatum diseaseresistant varieties and the further analysis of the infection and resistance mechanisms underlying southern blight disease.