Ten indigenous entomofungal strains of Beauveria bassiana, Metarhizium anisopliae, and M. rileyi were evaluated against 2nd instar larvae of the maize fall armyworm (FAW) Spodptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) in a laboratory bioassay. Among the ten strains tested, M. anisopliae ICAR-NBAIR Ma-35 caused 67.8% mortality, followed by B. bassiana ICAR-NBAIR Bb-45 with 64.3%, and ICAR-NBAIR Bb-11 with 57.1% mortality. Rest of the isolates showed 10.7–28.6% mortality. ICAR-NBAIR Ma-35 showed LC50 of 1.1 × 107 spores/ml and LT50 at 1 × 108 spores/ml is 86.04 h and ICAR-NBAIR Bb-45 showed LC50 of 1.9 × 107 spores/ml and LT50 at 1 × 108 spores/ml is 88.30 h. Field evaluation with these two promising strains were conducted against maize fall armyworm for 2 years (2018 and 2019) at ICAR-National Bureau of Agricultural Insect Resources experimental farm, Bengaluru, Karnataka, India. Field trial results indicated 68 and 69% reduction of FAW infestation and 55 and 62% increase in yield in the plots treated with M. anisopliae ICAR-NBAIR Ma-35/B. bassiana ICAR-NBAIR Bb-45, respectively, during 2018. In 2019, 70 and 76% reduction of FAW infestation and 44 and 55% increase in yield were observed in the plots treated with these two entomofungal pathogens, respectively.

中文翻译：

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昆虫病原真菌对玉米侵染性有害生物斜纹夜蛾（JE Smith）（鳞翅目：夜蛾科）的影响

在实验室生物测定中，针对玉米秋天粘虫（FAW）Spodptera frugiperda（JE Smith）（鳞翅目：夜蛾科）的第二龄幼虫，评估了十种球孢白僵菌（Berveria bassiana），白僵菌（Metrahizium anisopliae）和莱利氏菌（R. M. leyleyi）的本地真菌真菌菌株。在测试的十个菌株中，分枝分枝杆菌ICAR-NBAIR Ma-35引起67.8％的死亡率，其次是巴斯德球芽孢杆菌ICAR-NBAIR Bb-45的死亡率为64.3％，ICAR-NBAIR Bb-11的死亡率为57.1％。其余分离株显示出10.7–28.6％的死亡率。ICAR-NBAIR Ma-35的LC50为1.1×107孢子/ ml，LT50在1×108孢子/ ml为86.04 h; ICAR-NBAIR Bb-45的LC50为1.9×107孢子/ ml，LT50在1×108孢子/ ml是88.30小时。在印度卡纳塔克邦班加罗尔的ICAR国家农业昆虫资源局实验农场对这两个有前途的菌株进行了为期2年（2018年和2019年）的玉米秋夜蛾实地评估。田间试验结果表明，用异种分枝杆菌ICAR-NBAIR Ma-35 / B处理的地块中，一汽侵染减少了68％和69％，产量增加了55％和62％。分别在2018年期间释放了鲈鱼ICAR-NBAIR Bb-45。在2019年，用这两种肠真菌病原体处理的地块分别观察到一汽侵染减少了70％和76％，产量增加了44％和55％。