石斛篓象成虫对不同来源气味的行为反应

【目的】研究不同来源气味对石斛篓象Nassophasis sp.成虫嗅觉选择行为的影响，对于发展新型石斛篓象成虫防治技术具有重要意义。【方法】应用陷阱式嗅觉测定仪测试了石斛篓象成虫对同种个体气味、蛹壳气味、成虫粪便、球花石斛Dendrobium thyrsiflorum受害植株气味的嗅觉反应。【结果】雌成虫气味对雄成虫有引诱作用，对雌成虫没有引诱作用；雄虫气味对雌、雄成虫均无引诱效果。雌、雄蛹壳气味对雌、雄成虫均有显著引诱效果。两性成虫聚集时产生的粪便对雌、雄成虫均有显著引诱作用，雌虫或者雄虫单独放置时产生的粪便对雌、雄成虫均无引诱效果。被雌虫为害的球花石斛植株茎干释放的气味仅对雌虫有引诱作用， 而受雄虫为害后的茎干产生的气味仅对雄成虫有引诱作用。【结论】本研究为进一步分离、 鉴定对该虫有引诱作用的活性物质奠定了基础。

Behavioural responses of Nassophasis sp. (Coleoptera: Dryophthoridae) adults to different odor sources

【Aims】 Behavioural responses of adults of Nassophasis sp., a species infesting medicinal herb Dendrobium thyrsiflorum, to different odor sources were studied to explore new control methods towards this pest.【Methods】Behavioural responses of Nassophasis sp. adults to different odor sources including conspecifics, puparium, frass, and damaged stem of host plant, Dendrobium thyrsiflorum, were tested with pitfall olfactometer. 【Results】 The results indicated that odor emitted from females could only attract males but not females. The odor from males was not attractive to both sexes. Both sexes could be significantly attracted to puparium. Neither female produced frass nor male produced frass showed significant attraction to both sexes. When females and males aggregated, however, their frass demonstrated significant attraction to both sexes. Female adults only responded to female-damaged stem, while male adults only to male-damaged stem.【Conclusion】 These preliminary results may serve as basis to isolate and identify the attractive compounds from these odor sources.