It is not known, however, which compounds emitted by the vegetation of intact plants are necessary and sufficient to elicit upwind flight and oviposition. Volatile chemicals emanating from fruit have been identified as attractants for female moths ( Cossé, et al, 1994), as have volatiles emanating from flowers ( Haynes, et al., 1991 Heath, et al., 1992) and the volatile ensemble released from potted hostplants ( Landolt, 1989). By contrast, the role of olfactory information in a female moth's search for oviposition sites is less well understood. Pheromone-modulated behaviors, especially the responses of male moths to the sex pheromones released by conspecific females, have been studied in depth and are increasingly well understood in terms of both chemical ecology and neuroethology. For most species of insects, and for moths in particular, olfactory cues provide information about biologically relevant resources such as food, mates, and oviposition sites.
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