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

doi:10.16409/j.cnki.2095-039x.2019.05.033

Abstract

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 1^st, 2^nd and 3^rd 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 4^th 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 2^nd and 4^th 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

CLC Number:

S486
S476.1

PENG Guoxiong, ZHANG Shuling, ZHANG Wei, XIA Yuxian. Synergistic Effects of Fungal Insecticides and Baci1lus thuringiensis against Spodoptera frugiperda in Laboratory[J]. Chinese Journal Of Biological Control, 2019, 35(5): 735-740.

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