Abstract: For screening a deterrent to Monochamus alternatus Hope, electroantennogram (EAG) responses of the females and males of M. alternatus to volatiles from larval frass were measured, and field tests of hexane extracts of larval frass and mixtures of each compound identified from larval frass were carried out. EAG tests showed that α-pinene, β-pinene, 3-carene, limonene and longifolene all elicited EAG responses to the females and males of M. alternatus in different degrees. Butylated hydroxytoluene did not elicit EAG responses of the both sexes. Field tests showed that females gnawed significantly fewer oviposition scars on Pinus massoniana trees treated with hexane extracts of larval frass than on the control trees. Mean catch of females in traps with mixtures of synthetic compounds (3.80±1.02) was significantly fewer than those in the control traps (16.80±1.16). These results suggested that hexane extracts of larval frass and mixtures of α-pinene, β-pinene, 3-carene, limonene, longifolene and butylated hydroxytoluene can deter the females of M. alternatus and may be applied in management of this pest.

Key words: Monochamus alternatus, frass, volatiles, electroantennogram response, deterrent effect