我国首次发现草地螟卵寄生蜂-暗黑赤眼蜂

Trichogramma pintoi,a new parasitoid of Loxostege sticticalis eggs found firstly in the field of Northern China

本文报道了我国2008年8月初首次实地发现的草地螟卵寄生蜂及其寄生率和性比。所发现的卵寄生天敌为暗黑赤眼蜂(Trichogramma pintoi Voegele)(膜翅目:赤眼蜂科)。发现暗黑赤眼蜂的地区位于河北省康保县(114°11′～114°56′E,41°25′～42°08′N,海拔1400m)。暗黑赤眼蜂对2代草地螟卵的寄生率为1%左右,雌雄性比随采集日期的推迟而增加。

Trichogramma pintoi Voegele （Hymenoptera： Trichogrammatidae）, as an egg parasitoid of the beet webworm Loxostege sticticalis L, （Lepidoptera： Pyralidae） was firstly found in the second generation eggs collected in the fields of Kangbao county, Hebei Province （114°11′～114°56′E,41°25′～42°08′N, altitude 1 400 m） in early August of 2008. The parasitic rate of T. pintoi to the eggs of L. sticticalis in the field was around 1% and the sex ratio （female： male） increased as the season progressed.