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Single cell responses of pheromones host and non host volatiles in the ambrosia beetle trypodendron lineatum



Single cell responses of pheromones host and non host volatiles in the ambrosia beetle trypodendron lineatum



Entomologia Experimentalis et Applicata 52(2): 141-148



In the ambrosia beetle Trypodendron lineatum (Oliver) (Coleoptera: Scolytidae) a large number of olfactory receptor cells were identified keyed to the pheromone (+)-lineatin. No cell responding to pheromones adhering to other bark beetle genera was found. This indicates that T. lineatum do not benefit from recognizing other bark beetle species when colonizing a host. The results support previous field results that .alpha.-pinene and ethanol are signals of significance for T. lineatum. However, concerning .alpha.-pinene it should not be excluded that an other component might instead be the key odour. Results obtained by the combined gas chromatographical (GC) separation with electrophysiological single cell recordings, suggested that host odour cells respond to one or a few compounds and that minor constituents are rather important. Selective responses of a few cells to non-host volatiles further suggest that such signals may play a role as repellents or inhibitors when the beetles search for a host.

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