Abstract: 【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.

Key words: Nassophasis sp., behavioural response, conspecifics, frass, puparium, damaged-host plants