吉林省二代区玉米螟落卵与赤眼蜂寄生动态关系研究

通过11年的田间系统调查,明确玉米螟落卵与赤眼蜂寄生之间的动态关系。在一代玉米螟发生时期,玉米螟卵大部分孵化,孵化率达80%以上,只有少量被赤眼蜂寄生。二代玉米螟发生期赤眼蜂寄生率较高,卵块寄生率达70%以上,卵粒寄生率达60%以上。赤眼蜂寄生一般发生在玉米螟落卵中后期,且很少存在1个卵块被完全寄生的情况,赤眼蜂寄生情况年度间存在差异。

Dynamic Relationship between Asian Corn Borer Egg-laying and the Parasitism of Trichogramma in Two Generation Regions in Jilin Province

The dynamic relationship between the oviposition of corn borer and the parasitism of Trichogramma was clarified through 11 years field investigations. During the first generation corn borer egg stage, most of the eggs hatched, and the hatching rate reached more than 80%, only a small number of eggs were parasitized by Trichogramma. The parasitic rate of the second generation was higher, the parasitic rate of egg masses was more than 70%, and the parasitic rate of eggs was more than 60%. Trichogramma parasitism usually occurred in the middle and late stages of corn borer oviposition, and few egg masses were completely parasitized. The parasitic rate of Trichogramma was varied in different years. The results have important significance in revealing the relationship between pests and natural enemies.