Effects of bark beetle pheromones on the attraction of Monochamus alternatus to pine volatiles

We evaluated the attraction ofMonochamus alternatusHope (Coleoptera: Cer- ambycidae),DryocoetesluteusBlandfordandOrthotomicuserosusWollaston(Coleoptera: Curculionidae: Scolytinae) to multiple-funnel traps baited with the pine volatiles, ethanol and (+)-α-pinene and the bark beetle pheromones, ipsenol and ipsdienol. M. alternatus were attracted to traps baited with ethanol and (+)-α-pinene but not those baited with ips- dienol and ipsenol. Ipsdienol and ipsenol decreased catches ofM. alternatusin traps baited with ethanol and (+)-α-pinene. Traps baited with either binary combinations of ethanol and (+)-α-pinene or ipsdienol and ipsenol were attractive to D. luteus and O. erosus .T he addition of ipsenol and ipsdienol to traps baited with ethanol and (+)-α-pinene synergized attraction of O. erosus but not D. luteus.