莱氏野村菌LX050908001C菌株对斜纹夜蛾幼虫致病性的研究

Study on Pathogenicity of Nomuraea rileyi LX050908001C against larvae of Spodoptera litura Fabrieius

明确莱氏野村菌LX050908001C菌株对斜纹夜蛾幼虫的致病性,为该菌株在农业害虫防治中的开发应用及后续研究奠定基础。采用浸渍法进行莱氏野村菌LX050908001C分生孢子液对四龄和五龄斜纹夜蛾幼虫致病性测定。结果表明,莱氏野村菌LX050908001C对四龄幼虫的最高累计校正死亡率为92.47%,LC50为(1.341±0.052)×104个/mL,LT50为4.146±0.010 d;而对五龄幼虫的最高累计校正死亡率为84.76%,LC50为(4.410±0.658)×104个/mL,LT50为4.547±0.027 d。莱氏野村菌LX050908001C菌株对斜纹夜蛾四龄幼虫的致病性高于五龄幼虫的致病性。

In order to exploit Nomuraea rileyi and afford some base in subsequent study,the pathogenicity of Nomuraea rileyiLX050908001C against larvae of Spodoptera litura Fabrieius was ascertained.The pathogenicity of Nomuraea rileyi LX050908001C on 4th and 5th larvae of Spodoptera litura Fabrieius was determined through the dipping method.Results showed that adjusted accumulative mortality to 4th larvae was 92.47%,LC50 was（1.341±0.052）×104 spores/mL,LT50 was（4.146±0.010）d.And the adjusted accumulative mortality to 5th larvae was 84.76%,LC50 was（4.410±0.658）×104 spores/mL,LT50 was（4.547±0.027） d.The pathogenicity of Nomuraea rileyi LX050908001C against 4th larvae of Spodoptera litura Fabrieius was higher than that of it to 5th larvae.