Effects of 4 Kinds of Odor-active Compounds of Non-host Alnus ferdinandi-coburgii on the Post-embryonic Development of Tomicus yunnanensis(Coleoptera: Curculionidae: Scolytinae)

To broaden the knowledge on the pest declining fertility induced by the stressor of non-host plant odors, the post-embryonic developments of Yunnan pine shoot beetle, Tomicus yunnanensis, were tested by using odor-active compounds of Alnus ferdinandi-coburgii, including 4−allylanisole, trans−2−hexen−1−ol, (Z)−hexen−4−en−1−ol, and 4−ethylacetophenone, based on electrophysiological and behavioral responses of this beetle. The results showed the average egg productions per female individual were no significant difference among the 4 odor-stressed compounds, but the length of maternal gallery has an obvious increase(P<0.01). After hatching from their eggs, the lengthened rate of larval body length showed a declining trend in the stressor of trans−2−hexen−1−ol and 4−allylanisole as well as 4−allylanisole, but having an increase trend in(Z)−hexen−4−en−1−ol. All of compounds could gain higher weight than control group. Furthermore, there is a opposite trend in pupa and newly eclosed individual, especially for(Z)−hexen−4−en−1−ol and trans−2−hexen−1−ol. The former could have reduced the relative body length and weight for 16.63% and 20.09% in pupa, the latter is 6.95% and 15.78% in the newly adults, respectively. The results showed that the 4 odor-active compounds of non-host A. ferdinandi-coburgii could significantly interfere with the post-embryonic development of T. yunnanensis, especially the two green leaf volatiles trans-2-Hexen-1-ol and(Z)-Hex-4-en-1-ol could directly reduce the body size and weight of pupae and newly emerged adults.