蝇蛹俑小蜂对橘小实蝇和瓜实蝇的偏好性

Preference of the parasitoid Spalangia endius Walker to its hosts,Bactrocera dorsalis and B. cucurbitae

【背景】蝇蛹俑小蜂是实蝇类害虫蛹期的一种重要寄生蜂,对压制下一代实蝇类害虫的种群数量具有重要作用,但有关其对不同实蝇害虫的寄生特性尚缺乏研究。【方法】采用"H"型装置和培养皿测定方法,研究了蝇蛹俑小蜂的寄主选择偏好性。【结果】蝇蛹俑小蜂在橘小实蝇蛹和瓜实蝇蛹共存的情况下,偏好在橘小实蝇蛹上停留,且寄生率较高,最高寄生率达61.11%。【结论与意义】本研究为合理利用蝇蛹俑小蜂控制实蝇类害虫提供了理论基础。

【Background】Spalangia endius（ Walker）（ Hymenoptera： Pteromalidae） is a solitary pupal endoparasitoid parasitizing many species of Diptera. This makes the species a good candidate for the biological control of flies. 【Method】In order to understand host species preference of S. endius, ＂ H＂ tube and Petri dish experiments were performed in the laboratory.【Result】When exposed to pupae of the fruit flies Bactrocera dorsalis and B. cucurbitae,the parasitoid preferred B. dorsalis,with the highest parasitization rate 61.11%. 【Conclusion and significance】The detected preference by S. endius indicates that prey quality is important for this parasitoid,which can provide theoretical basis for possible mass rearing in attempts to control fruit fly pests.