Synergistic Effects of Fungal Insecticides and Baci1lus thuringiensis against Spodoptera frugiperda in Laboratory
Release time ：
2020-07-13
Synergistic Effects of Fungal Insecticides and Baci1lus thuringiensis against: Spodoptera frugiperda in Laboratory
Chinese Journal of Biological Control
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 anisopliaeCQMa421, Beauveria bassianaZJU435 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, 2ndand 3rdinstar 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 4thinstar 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 2ndand 4thinstar 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 ofS. frugiperdain field.
Key words: Spodoptera frugiperda;Metarhizium anisopliae;Beauveria bassiana; Baci1lus thuringiensis;
insecticidal activity
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