几种虫生真菌对斜纹夜蛾的致病性

Pathogenicity of several fungal species on Spodoptera litura

用布氏白僵菌、球孢白僵菌、玫烟色拟青霉、绿僵菌和莱氏野村菌5种真菌的固体培养物,对斜纹夜蛾2、3龄幼虫进行了毒力测定.结果表明:布氏白僵菌和莱氏野村菌两种菌株对斜纹夜蛾幼虫有明显的致病效果,对2龄幼虫的致死中时(LT50)分别为2.95d和4.10d,累计校正死亡率分别为100%和95.2%;对3龄幼虫的致病力低于2龄,致死中时(LT50)分别为19.67d和19.63d,累计校正死亡率分别为56.6%和52.2%.玫烟色拟青霉、球孢白僵菌两菌株也有一定的致病力,对2龄幼虫的致死中时(LT50)分别为4.89d和6.34d,累计校正死亡率分别为85.7%和71.4%.

The virulence test of five species of entomogenous fungi Beauveria brongniartii, Beauveria bassiana, Paecilomyces fumosoroseus, Metarhizium anisopliae and Nomuraea rileyi to Spodoptera litura larvae showed that B. brongniartii and N. rileyi had evident pathogenic effects on S. litura, with the LTs0 value to S. litura 2nd instars being 2.95 and 4.10 days, and the corrected accumulative mortality of the instars being 100% and 95.2%, respectively. The virulence of B. brongniartii and N. rileyi to the 3rd instars was lower than that of 2nd instars. The LTs0 value to 3rd instars was 19.67 and 19.63 days, and the corrected accumulative mortality was 56.6% and 52.2%, respectively. Other two fungal species P. fumosoroseus and B. bassiana also had virulence to S. litura larvae. The LTs0 value for the 2nd instars was 4.89 and 6.34 days, and the corrected accumulative mortality reached 85.7% and 71.4% , respectively.