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寄主龄期对前裂长管茧蜂寄生与生长发育的影响

DOI: 10.7671/j.issn.1001-411X.2012.04.008, PP. 465-469

Keywords: 橘小实蝇,前裂长管茧蜂,寄主龄期,寄生,生长发育

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Abstract:

在26℃条件下，以橘小实蝇Bctroceratdorsalis1龄、2龄、3龄初及3龄末幼虫为寄主，研究了前裂长管茧蜂Diachasmimorphalongicaudata对不同龄期寄主的寄生效能、各虫态发育历期、存活率、个体大小、性比、结果表明，寄主龄期对前裂长管茧蜂寄生效能与生长发育有明显影响.前裂长管茧蜂偏好寄生2龄和3龄初的橘小实蝇幼虫，在试验观察的6h内，分别有63.00与85.50头相应龄期的橘小实蝇幼虫被寄生.而仅有35.60与33.21头1龄和3龄末橘小实蝇幼虫被寄生.前裂长管茧蜂各虫态的发育速率随寄主年龄的增加而逐步减缓.以1龄、2龄、3龄初及3龄末橘小实蝇幼虫为繁育寄主时，前裂长管茧蜂的世代发育历期分别为18.5、18.9、19.6和22.0d，相应的幼期存活率分别为16.40%、46.88%、54.09%和26.29%，寄主龄期过低或过高对前裂长管茧蜂的生长发育有明显的抑制作用.前裂长管茧蜂子代个体的大小也因寄主龄期的不同而有所差异，以1龄橘小实蝇幼虫为寄主所繁育寄生蜂个体明显小于其他年龄段寄主繁育的寄生蜂.以3龄初橘小实蝇幼虫为繁育寄主时，前裂长管茧蜂子代群体以雌性个体为主，雌性概率为64.11%.3龄初橘小实蝇幼虫是用于繁殖前裂长管茧蜂的最适阶段.

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