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青县自1977年开始人工繁殖松毛虫赤眼蜂用以防治玉米螟。1977年放蜂面积1.5万亩,1981年扩大到11.5万亩。但均未达到控制玉米螟为害的目的。经对赤眼蜂种类进行调查鉴定结果,放蜂区和非放蜂区的优势蜂种均为玉米螟赤眼蜂,现将结果简报于后:1980年我们从孙楼等放蜂区采集第二、三代玉米螟寄生卵块265块,经出蜂鉴定,
Qingxian since 1977 Artificial propagation Trichogramma Trichogramma used to control corn borer. In 1977, the area for beekeeping was 15,000 mu and in 1981 it was expanded to 115,000 mu. But did not achieve the purpose of controlling corn borer damage. After the species of Trichogramma were investigated and identified, the dominant bees of the bee-decapitated and non-bee-protected regions were Trichogramma ostriniae, and the results were summarized in the following: In 1980, Two or three generations of corn borer parasitic egg block 265, identified by the bees,