Abstract:Effect of the Asian corn borer, Ostrinia furnacalis (Guenée), and Fusarium verticillioides infestation on the corn yield was investigated. The corn ears were inoculated with neonate larvae of Asian corn borer, F.verticillioides, respectively, or Asian corn borer larvae and F.verticillioides together at silking, blister and milk stage of corn ear development. Results showed that it resulted in the corn ear length shortened, the number of the corn seed decreased and the ear rot became more serious, and also other corn yield components were affected, such as the number per row, 100-seed weight yield of single ear, when inoculated with Asian corn borer neonate larvae and F.verticillioides, separately or together. The yield of single ear significantly decreased at silking stage, with 40.84%, 27.92% and 11.10% at blister and milk stage, respectively, when inoculated with the O.furnacalis neonate larvae and the F.verticillioides together. However, the yield of single ear significantly decreased at blister stage, with 6.62%, 4.13% and 0.65% at silking, milk stages, respectively, when inoculated with the F.verticillioides only.