红脉穗螟天敌-扁股小蜂生物学特性的研究

在实验室条件下，对红脉穗螟(Tirathaba rufivena Walker)天敌-扁股小蜂Elasmus sp.]生物学特性进行了观察研究。结果表明，成蜂大部分在夜间羽化，雌雄蜂羽化高峰期分别为1:00~03:00和23:00~1:00点；雌雄性比为1∶1.2；雌蜂羽化当天就可交尾产卵,该蜂兼营两性生殖和孤雌生殖,未交尾雌蜂繁殖的子代为雄性；在26±0.5℃和75±5%相对湿度条件下，卵、幼虫和蛹的发育历期分别为0.9、4.2和7.2天。成虫以蜂蜜为补充营养可延长其寿命。

Study on Biological Characteristics of Elasmus sp. a parasitoid of Tirathaba rufivena Walker

The Biological Characteristics of Elasmus sp. a parasitoid of Tirathaba rufivena Walker were observated in laboratory. The results showed that the adults emerged mainly in the evening, with the peak emergence of female and male adults at 1：00-3：00 and 23：00-1：00 respectively. The sex ratio in laboratory populations （ ♀：♂） was 1：1.2. The female adults could mate and oviposite in 24 hours after emergence. The adult can reproduce in both ways of amphigony and parthenogenesis; the unmated females could only produce male progeny. Under （26±0.5）℃ and 75%± 5%RH condition, the developmental duration of egg, larva and pupa were 0.9, 4.2 and 7.2d respectively. Feeding prolonged. on honey water solution, the adult longevity could be prolonged.