Abstract: [Objective] To select volatile substances which could significantly repel or lure Cryptorrhynchus lapathi by screening 12 plant volatiles, and provide theoretical basis for production of repellents or attractants to effectively control this pest.[Method] EAG technique was used to exam antennal electrophysiology reactions of C. lapathi to 12 plant volatiles. Substances showed significant difference comparing with control were selected, and the effective concentrations were determined. Y type olfactometer and wind tunnel bioassays were carried out based on the results of EAG experiment.[Result] Six plant volatiles, furfural, benzoic acid, eugenol, nerol, β-cltronellol, and cedar oil, could arouse both male and female adult showing significantly higher EAG reaction (P< 0.05), and the effective concentration was 1 mol·L^-1. In Y type olfactometer behavioral response test, furfural (a host plant volatile) showed significantly higher luring effect on female adults of C. lapathi (P< 0.01), and the luring rate was 71.59%. Nerol (a non-host plant volatile) showed significantly higher repelling effect on female adults of C. lapathi (P < 0.01), and the repelling rate was up to 81.5%. In the wind tunnel bioassay, benzoic acid (a host plant volatile) showed significantly higher repelling effect on female C. lapathi, the repelling rate reached 74.68%, and male C. lapathi was significantly repelled by cedar oil (a non-host plant volatile) (P < 0.01), the repelling rate was 78.75%.[Conclusion] Non-host plant volatiles showed slightly higher impact on the behavior of adult C. lapathi than host plant volatiles, and females of C. lapathi were more sensitive to those plant volatiles than males in our tests. Both Y type olfactometer and the wind tunnel bioassays produced ideal results.

Key words: Cryptorrhynchus lapathi, plant volatiles, electroantennogram(EAG), Y type olfactometer, wind tunnel