玉米螟赤眼蜂在甜玉米地寄生率和扩散规律的研究

Parasitization by dispersion of Trichogramma ostriniae in sweet corn fields.

调查研究了玉米螟赤眼蜂TrichogrammaostriniaePangetChen在甜玉米地的年消长动态、日活动规律 ,以及对不同甜玉米品种和不同防治类型地亚洲玉米螟Ostriniafurnacalis (Guenee)卵的寄生率。玉米螟赤眼蜂田间扩散规律为 :在苗期 ,按每点 2 0 0 0头的蜂量相距 3 2m左右释放玉米螟赤眼蜂 ,即可达到 5 0 %以上的寄生率 ;在穗期 ,按每点 2 0 0 0头的蜂量相距 2 4m左右释放玉米螟赤眼蜂 ,可达到 80

The annual population dynamics and daily activity patterns of Trichogramma ostriniae were investigated. Parasitization rates differed in different varieties of sweet corn and control fields. Optimum release rate and dispersal distance were obtained by studying dispersal patterns. In the early growing period where the release rate was 2?000 wasps per site and the release sites were 32 metres apart the parasitization rate was >50%. In the later growing period where the release rate was 2?000 wasps per site and release sites were 24 metres apart the parasitization rate was >80%.