Population Dynamic and Damage of Ostrinia furnacalis in the Corn Fields

This paper investigated Ostrinia furnacalis including the number of eggs laid,damage degree of spring corn in the spring corn fields from June to August of 2010 in Qinghuangdao.The result showed that the occurrence of the Asian corn borer was two generations in the whole year,and peak stage of eggs laid occurred in the middle of June and the end of July to early August,with the number of eggs reaching 400 and 374 respectively.Furthermore,first generation hatchability of Asian corn borer,second generation hatchability of Asian corn borer,the percentage of damage leaves,damage stems and maize ears was 97.18%,96.09%,86%,100%,77% and 66.92% respectively.The numbers of holes,damage stems,and corn ears by the Asian corn borer for every 100 plants were 754,70 and 77 respectively.The natural parasitization of Trichgramma ostriniae reached 21.56%.