关键词: 亚洲玉米螟, 越冬, 白僵菌, 茧蜂, 寄蝇

Abstract: Survival and development of overwintering larvae of the Asian corn borer (ACB), Ostrinia furnacalis, was surveyed in the Aprils of 2009 to 2012 to clarify the key lethal factors and the development trends after winter in Shenyang area. Results showed that mortality of ACB overwintering larvae ranged between 45%—65%, resulting from biotic and abiotic factors. The main natural biocontrol elements of the overwintering larvae were the white muscardine fungus (Beauvaria bassiana), a braconid wasp (Macrocentrus cingulum) and a tachinid fly (Lydella grisescens), which resulted in mortality ranged between 22.50%—34.11%. The three natural elements accounted for varied ACB mortality among years, but a complementary or competitive effect could be noticed. The occurrence of the three natural enemies was different, white muscardine appeared before peak of moth eclosion, braconid wasp appeared after the peak of moth eclosion, and the tachinid fly came in between. White muscardine fungus has the potential to infect other healthy overwintering larvae. Eclosion period of the Asian corn borer at room temperature was around 18 d, eclosion start and end were earlier in male than in female. The sex ratio varied among years.

Key words: Ostrinia furnacalis, overwintering, white muscardine fungi, braconid wasp, tachinid fly