Electrophysiological Responses of the Diamondback Moth, Plutella xylostella(L.)to Nine Crucifer Volatiles

Electroantennogram(EAG)was employed to record the electrophysiolog ical responses of the diamondback moth(DBM)adult to crucifer of nine volatiles.The results showed higher EAG responses of DBM to six carbon alcohol and aldehyde were displayed,such as 1-hexanol,hexanal,trans-2-hexen-1-al.However,the weaker EAG responses of DBM to terpenes such as(1R)-(+)-α-pinene,α-terpinene,(+)-3-carene,1,8-cineole and d-limonene were displayed.The EAG responses were enhanced with the increase in concentration,of 1-hexanol,hexanal,trans-2-hexen-1-al,heptanal,α-terpinene and d-limonene respectively.The EAG response to(1R)-(+)-α-pinene,(+)-3-carene and 1,8-cineole were decreased at first and then increased to the maximum with increasing concentrations.The highest EAG response in female was to trans-2-hexen-1-al and the EAG relative value was approximately 331%,and that in male was to 1-hexanol and the EAG relative value was approximately 298%.The maximal differences of EAG relative values of DBM responding to the same concentration of volatiles were no more than two fold.