Chemical Compounds Emitted from Mentha spicata Repel Aromia bungii Females

(Coleoptera: Cerambycidae) is an economically important wood-boring insect pest of stone fruit trees, particularly , in China. It has entered Japan and several European countries as an invasive species in recent years. It is difficult to control because of the cryptic feeding behaviour of larvae beneath the bark. Identification of repellent constituents from non-host plants has potential for use in management strategies against this beetle. is cultivated extensively in Hebei Province (China) as a medicinal plant. Firstly, antennal responses of female to volatiles were evaluated by coupled gas chromatography-electroantennograms (GC-EAD), and then the EAD-active components were tested in semi-field trials. The results showed that females were significantly repelled by myrcene, ( )-(+)-carvone, ( )-β-caryophyllene, and borneol compared with the control. The presence of myrcene (100 µL; 90% purity), ( )-(+)-carvone (200 µL; 96% purity), ( )-β-caryophyllene (500 µL; 98.5% purity), and borneol (800 µL; 80% purity) significantly reduced the perching rates of females on both peach logs and leaves. Considering cost and commercial availability, we suggest that myrcene, ( )-(+)-carvone, and ( )-β-caryophyllene could be promising repellents against females in the field.