摘要桑螟是桑树重要害虫，近年来在我国各主要蚕区多次暴发，严重制约蚕桑业发展。开展以寄生性天敌控害利用为核心的桑树害虫生物防治，是桑树害虫综合治理的新途径。本研究通过寄主龄期非选择性及选择性试验及微观结构观测，探究混腔室茧蜂的特征生物学特性。研究结果表明：1）混腔室茧蜂的寄生率、子代体型大小、茧重与寄主龄期无显著依赖关系；2）混腔室茧蜂发育时间与寄生时寄主龄期密切相关；3）混腔室茧蜂对不同龄期寄主桑螟不存在寄生选择性；4）混腔室茧蜂幼虫啮出寄主体腔后，存在继续取食寄主行为，取食行为持续时间约为4。5h，消耗寄主资源彻底而迅速；5）混腔室茧蜂的触角存在毛形感器、刺形感器I、刺形感器II、板形感器、Bӧhm鬃毛和锥形感器等6种化学感器。本研究获得的数据和结论有利于丰富和完善寄生蜂发育模式的理论和假说，对于开展桑树害虫生物防治工作也具有重要的指导意义。86854

毕业论文关键词：桑螟；混腔室茧蜂；生物防治；特征生物学

Abstract The mulberry pyralid, Diaphania pyloalis is an important pest of mulberry and outbreaks at main sericultural products area in China resently and has caused serious problems for sericulture。 Developing biological control methods which mainly consists of utilizing parasitic nature enemies would be a new avenue of integrated pest management。 In the present study, we conducted a series of experiment to explore characteristic biology of Aulacocentrus confusum by host instar choice and non-choice experiments and ultrastructure observation。 The results showed that: 1) The parasitism rate, offspring body size and cocoon weight didn’t rely on host instar。 2) By contrast, larvae development relied on host instar。 3) A。 confusum females didn’t show preference between host instars。 4) Sensilla trichodea, Sensilla cheatica, Sensilla cheatica, sensillum placodea, Bӧhm bristles and Sensilla basiconca were observed in antenna by using SEM。 5) Post egression host feeding behavior was observed。 This feeding behavior persist ca。 4。5 h and the parasitoids larvae consumed host tissues swiftly。 The present study could enrich and improve the theory and hypothesis about parasitic wasp development and meanwhile, it would provide constructive guide for biological control practice of mulberry pests。

Keywords: Diaphania pyloalis; Aulacocentrus confusum ; Biological control; Characteristic biology

目  录

第一章  绪论 1

1。1 前言 1

1。2 寄生蜂的生活史策略 2

1。3 寄生蜂在桑树生物防治中的应用 6

1。4 选题的目的意义和主要研究内容 9

1。4。1 选题目的 9

1。4。2 研究意义 9

1。4。3 主要研究内容 10

第二章  实验材料与方法 10

2。1 实验材料 10

2。2。1 寄主非选择性实验 11

2。2。2 寄主龄期选择性实验 11

2。2 触角感器电镜观察 11

第三章 结果与讨论 12

3。1 混腔室茧蜂对不同龄期寄主桑螟的非选择性试验 12

3。2 混腔室茧蜂寄生桑螟幼虫后的子代蛹重 13