通过11年的田间系统调查，明确了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，孵化率达到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，卵块寄生率达到70%以上，卵粒寄生率达到60%以上。赤眼蜂寄生一般发生在玉米螟落卵中后期，且很少存在一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。本研究结果对于揭示害虫天敌关系，正确开展玉米螟生物防治具有重要意义。
英文摘要:
The dynamic relationship between the oviposition of corn borer and the parasitism of Trichogramma was clarified through 11 years field investigation. 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 were varied in different years. The results play an important significance in revealing the relationship between pests and natural enemies. Moreover, our studies have great practical implications for carrying out corn borer biological control.
查看全文
;
