Electroantennogram, behavioural responses, and field trapping of Trypophloeus klimeschi (Coleoptera: Curculionidae: Scolytinae) to eight host volatiles

Trypophloeus klimeschiEggers (Coleoptera: Curculionidae: Scolytinae) was first discovered in China in 2003, and it exhibits strong species specificity toPopulus albavar.pyramidalisBunge (Salicaceae). To screen plant volatile compounds for monitoring and trappingT. klimeschi, the electroantennogram responses of adultT. klimeschito eight plant volatiles, including nonanal, 2-methylbutanal, decanal, 2-hydroxybenzaldehyde, (Z)-3-hexen-1-ol benzoate, methyl benzoate, methyl salicylate, and geraniol were tested at various concentrations. Behavioural responses of female and male adults to various concentrations of these eight plant volatiles were also determined using a Y-tube olfactometer. We then tested the effectiveness of these compounds as lures for trappingT. klimeschiin the field. Electroantennogram tests showed thatT. klimeschipossesses olfactory sensitivity for eight compounds. Additionally, walkingT. klimeschiexhibited attraction to low concentrations (≤ 1 μg/μL) of all eight compounds in Y-tube olfactometer. Field experiment results indicated that baits composed of each volatile compound alone were more attractive to greater numbers ofT.klimeschithan the control. The methyl benzoate bait was better attracted byT.klimeschithan other tested volatiles. These results suggest that these compounds could be used in attraction of this stem-boring pest. This study could have important implications for the development of an effective semiochemical-based management tool forT. klimeschiin the field.