Objective To evaluate the virulence of Aspergillus nomius ACB1042 against Ostrinia furnacalis.

Methods The insecticidal activity of Ostrinia furnacalis and its effects on pupal emergence rate, adult egg laying capacity and egg hatchability were determined by spraying method.

Results The results showed that Aspergillus nomius had insecticidal activity against different species of Ostrinia furnacalis. On the 15th day of treatment, with the increase of spore concentration, the cumulative mortality rate and the mycosis rate of Ostrinia furnacalis increased by 52.67% and 65.44% respectively. The third instar larvae were the most sensitive to Aspergillus nomius. LC₅₀ and LT₅₀ of the eighth day were 3.54×10⁵ spores /mL and 5.87 days, respectively. In addition, compared with the control, the chrysalis emergence rate, adult spawning amount and egg hatchability of Ostrinia furnacalis were also significantly reduced by Aspergillus nomius sores (P<0.05). When the spore concentration increased from 1.9×10¹ spores /mL to 1.9×10⁸ spores /mL, the pupa emergence rate, adult spawning amount and egg hatchability decreased by 25%, 2202 eggs and 44.32%, respectively.

Conclusion In conclusion, Aspergillus nomius has good insecticidal activity against the Ostrinia furnacalis, and fine good development potential in its biological control.