Abstract:

Dendrolimus superans is one of the important pests feeding the needles of Larix gmelinii. The electroantennogram (EAG) responses of D. superans were tested to the standard compounds: (1R)-(+)-α-pinene, (1S)-(-)-α-pinene, ocimene, (1S)-(-)-β-pinene, R(-)-α-phellandrene and camphene, the main profiles of the volatiles from L. gmelinii. The result showed a regularity that the EAG responses follow the regularity: the virgin females>mated females>males no mated to 0.1 μL·μL^-1 R(-)-α-phellandrene, and the mated females>virgin females>males no mated to the other volatiles and concentrations. There were significant differences between the EAG responses of virgin females and males no mated (P<0.05), and the EAG responses of mated females had an extremely significant difference from that of virgin females and males no mated (P<0.01), which showed that the mated females are more active to the volatiles of its host plant. The EAG responses of the mated females, virgin females, males no mated were more sensitive to R(-)-α-phellandrene. In dark period, activity time for the EAG responses of mated females and males no mated is during 20:00—4:00 o'clock,the same to its eclosion, mating and oviposition period.

Key words: Dendrolimus superans, plant volatiles, EAG response, Larix gmelinii