《环境昆虫学报》

马尼拉侧沟茧蜂Microplitis manilae是斜纹夜蛾Spodoptera litura的一种重要幼虫寄生蜂。本文以斜纹夜蛾2龄幼虫为寄主，在26±1℃、RH 65%±5%、L：D=12:12的人工气候箱内，研究生殖方式、雌蜂日龄、寄生时间段、雄蜂出现与否以及雄蜂密度等因子对其寄生效能的影响。结果表明：马尼拉侧沟茧蜂可营产雄孤雌生殖和两性生殖两种生殖方式，两种方式在亲代寄生率、子代羽化率和发育历期均无显著差异。随着雌蜂日龄的增加，其寄生率和子代性比显著降低，但子代发育历期随雌蜂日龄的增加而延长。马尼拉侧沟茧蜂在12:00-18:00时间段的寄生率、子代羽化率和性比最高，子代发育历期最短。当寄生蜂密度一定时，子代性比随着寄主密度的增加而显著增加；当寄主密度一定时，子代性比随着寄生蜂密度的增加而显著下降；雄蜂在场时，子代性比显著高于无雄蜂在场时。子代性比随着亲代雄蜂密度的增加而显著降低，但雄蜂密度对亲代寄生率，子代羽化率、发育历期无显著影响。

英文摘要:

Microplitis manilae Ashmead was an important parasitoid of the larvae of Spodoptera litura (Fabricius). Under laboratory conditions of (26±1)℃, RH(65±5)% and photoperiod 12 h ∶12 h, the effect of reproductive mode, female age, parasitic period, the presence of male and density on the efficiency of Mmanilae were evaluated．The result showed that Mmanilae employed both parthenogenesis and bisexual reproduction, and the parasitic rate had no significant difference between both reproductive modes, as well as progeny development duration and emergence rate The parasitic rate and progeny sex ratio significantly decreased in older female adult, while the offspring development duration significantly increased When parasitism occurring at 12:00-18:00pm, the highest parasitic rate, progeny sex ratio and emergence rate, as well as the shortest progeny development duration were observed The progeny sex ratio tended to increase obviously with increased host density, but decreased obviously with increased parasitoid density The presence of male parasitoids significantly 〖JP3〗increased the proportion of female progeny The progeny sex ratio decreased obviously with increased male density, but male density had no significant influence on parasitic rate, progeny development duration and emergence rate

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