斜纹夜蛾取食四种植物对马尼拉侧沟茧蜂发育和繁殖的影响

研究斜纹夜蛾Spodoptera litura幼虫取食4种植物后对马尼拉侧沟茧蜂Microplitis manilae生长发育和繁殖的影响,为利用该蜂开展斜纹夜蛾的生物防治提供理论依据。在人工气候箱内(26℃±1℃、RH 65%±5%、L∶D=12∶12)研究了斜纹夜蛾取食豇豆Vigna unguiculata、芋艿Colocasia esculenta、烟草Nicotiana tabacum和芥蓝Brassica alboglabra 4种植物对马尼拉侧沟茧蜂的生长发育和繁殖的影响。结果表明:马尼拉侧沟茧蜂寄生取食豇豆的夜蛾幼虫,其幼虫期最短,化蛹率、羽化率和累计存活率最高,性比最低,寿命最长;寄生取食烟草的夜蛾幼虫,其幼虫期最长,化蛹率、羽化率和累计存活率最低,蛹重最轻,蛹期最长;从取食芥蓝的斜纹夜蛾幼虫体内育出的雌蜂产卵量最高,但成蜂寿命最短;斜纹夜蛾取食4种植物对雌蜂个体大小无显著影响,但取食烟草的夜蛾幼虫体内育出的雄蜂个体最小。马尼拉侧沟茧蜂寄生取食不同植物的斜纹夜蛾幼虫,马尼拉侧沟茧蜂的发育和繁殖存在显著差异。

Effects of Spodoptera litura feeding on four host plants on development and fecundity of Microplitis manilae (Ashmead)

To provide a theoretical basis for the biological control of Spodoptera litura with Microplitis manilae. Under laboratory conditions, temperature 26℃ ± 1℃, RH 65% ± 5% and photoperiod 12 h∶12 h, the effects of S. litura larvae after feeding four kinds of plants, Vigna unguiculata, Colocasia esculenta, Nicotiana tabacum, Brassica alboglabra, on developmental duration and fecundity of M. manilae were evaluated. The results showed that M. manilae parasitized S. litura larvae feeding on V. unguiculata had the shortest larvae duration, the highest pupation rate, eclosion rate and total survival rate, the lowest sex ratio and the longest adult lifespan;M. manilae parasitized S. litura larvae feeding on N. tabacum, the longest larvae duration, the lowest pupation rate, eclosion rate and total survival rate, the lightest pupal weight and the longest pupal duration were observed; M. manilae developed from S. litura larvae feeding on B. alboglabra, female adult had the highest fecundity and the lowest lifespan; There was no significant effect on the size of individual females parasitoids when S. litura feeding on four kinds of plants. However, the male parasitoids emergenced from S. litura larvae feeding on N. tabacum had the smallest size. There are significant differences in M. manilae development and reproduction, when wasps parasitized S. litura larvae feeding different plants.