Attraction of the bark beetle Tomicus piniperda and some other bark‐ and wood‐living beetles to the host volatiles α‐pinene and ethanol

The attraction of some bark‐ and ambrosia beetles as well as associated beetles to the host volatiles α‐pinene and ethanol was studied in field tests with flight barrier traps. Tomicus piniperda (L.) (Scolytidae), Thanasimus formicarius (L.) (Cleridae), and Rhizophagus ferrugineus (Payk.) (Rhizophagidae) were attracted by α‐pinene, while Hylurgops palliatus (Gyll.) and Trypodendron lineatum (Oliv.) (Scolytidae) were attracted by ethanol and Epuraea spp. (Nitidulidae) by both α‐pinene and ethanol. Combinations of α‐pinene and ethanol attracted high numbers of H. palliatus, T. lineatum, R. ferrugineus, Epuraea spp., and Glischrochilus spp. (Nitidulidae) and the catches increased with increasing release rates of ethanol. By contrast, lower numbers of T. piniperda were caught in traps baited with combinations of α‐pinene and ethanol than in traps baited with α‐pinene alone, and the catches of this species decreased with increasing release rates of ethanol. Traps baited with a combination of α‐pinene and ethanol or with α‐pinene alone caught similar numbers of T. formicarius. The results are discussed on the basis of species differences in preference for breeding substrate.