Abstract:

In this paper, it was investigated on Ostrinia furnacalis including number of eggs laid, damage degree of spring corn in the spring corn field from June to September of 2007 in Qinhuangdao and releasing Trichogramma dendrolimi in the spring and summer corn field to control second generation Ostrinia furnacalis as the biological control methods on July, 29th. The results were as follows.The occurrence of the Asian corn borer was two generation in the whole year. And peak stage of eggs laid were respectively occurred in the middle of June and the early August, meanwhile, numbers of egg masses were reached 800 and 748 separately.Furthermore, the percentage of damage leaves, damage stems and maize ears were up to 78%, 96% and74%, respectively. The numbers of hole were up to 340 and 102 in the damage stems and corn ears by the Asian corn borer. Through releasing Trichogramma dendrolimi in the spring and summer corn fields, the parasitization rate of eggs in the second generation Asian corn borer were 80.00% and 81.44%, and by comparison with CK , the reducing rates of hole of control groups in damage stems and corn ears were up to 53.05% and 69.53%, respectively.It was concluded that the population of Asian corn borer was large and the damage by the pest was heavy in the spring corn fields, and Ostrinia furnacalis had a good action in the control of Asian corn borer.