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Chinese Journal Of Biological Control ›› 2019, Vol. 35 ›› Issue (5): 735-740.DOI: 10.16409/j.cnki.2095-039x.2019.05.033

• Biological Control of Spodoptera frugiperda Previous Articles     Next Articles

Synergistic Effects of Fungal Insecticides and Baci1lus thuringiensis against Spodoptera frugiperda in Laboratory

PENG Guoxiong1, ZHANG Shuling2, ZHANG Wei1, XIA Yuxian1   

  1. 1. Genetic Engineering Research Center/College of Life Sciences, Chongqing University/Chongqing Engineering Research Center for Fungal Insecticides, Chongqing 400030, China;
    2. Chongqing Green-Bio Institute Co., Ltd., Chongqing 404100, China
  • Received:2019-09-06 Online:2019-10-08 Published:2019-10-26

Abstract: Spodoptera frugiperda (J. E. Smith) is a global migratory pest. To evaluate the potential of combined microbial insecticides for control of S. frugiperda, the combinations of two microbial pesticides among Metarhizium anisopliae CQMa421, Beauveria bassiana ZJU435 and Baci1lus thuringiensis (Bt) G033A were investigated under laboratory conditions. The results showed that the combination of CQMa421-ZJU435 achieved the corrected mortality of 65.6%, 58.8% and 35.4% against the 1st, 2nd and 3rd instar larvae, respectively, significantly higher than that in the treatments with CQMa421 or ZJU435 alone at 10 days post inoculation. Five days post inoculation of CQMa421-Bt, the corrected mortality of the 4th instar larvae was 82.6%, significantly higher than that in the treatment with CQMa421 (21.1%) or G033A (65.5%) alone. Five days post inoculation of ZJU435-Bt, the corrected mortality of the 2nd and 4th instar larvae were 80.4% and 68.6%%, significantly higher than that in the treatment with ZJU435 or G033A alone. This indicates that combination of different fungal insecticides with Bt could effectively improve the insecticidal activity against S. frugiperdaa larvae. These results have paved the way for mixed application microbial pesticides for control of S. frugiperda in field.

Key words: Spodoptera frugiperda, Metarhizium anisopliae, Beauveria bassiana, Baci1lus thuringiensis, insecticidal activity

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