Abstract: In order to study the effects of green leaf volatiles (GLVs) emitted by broad-leaved plants to the Yunnan pine shoot beetle, Tomicus yunnanesis, three most abundant GLVs ［(E)-2-hexenal, (E)-2-hexen-1-ol and (Z)-3-hexen-1-ol］ were chosen in the experiments. Single components and blends of two components were used to study the effects on the host-location behavior of T. yunnanesis by laboratory pine twig feeding test. At 12, 24 and 48 h after testing, the beetles which got into the pine twigs were counted. The results showed that the three GLVs and their blends can interrupt the host-location behavior of T. yunnanesis at different degree. At 12 h after testing, three single components ［A: (E)-2-hexenal, P＜0.01; B: (E)-2-hexen-1-ol, P＜0.01; C: (Z)-3-hexen-1-ol; P＜0.01］ and two blends ［D: (E)-2-hexenal+(E)-2-hexen-1-ol, P＜0.01; E: (E)-2-hexenal+(Z)-3-hexen-1-ol, P＜0.01］ had significant differences in the number of beetles stayed outside the pine twigs when compared to the control. These GLVs significantly inhibited the infestation probability of P. yunnanesis by T. yunnanesis. At 24 h after testing, group D (P＜0.01) and E (P＜0.01) exhibited significant differences in the number of beetles stayed outside the pine twigs from the control group. However, only group D (P＜0.01) had significant difference in the number of beetles stayed outside the pine twigs from the control group at 48 h after testing. This study provides valuable basis for using secondary metabolites in non-host plants to control T. yunnanesis in the future.

Key words: Tomicus yunnanesis; Pinus yunnanesis')">

Tomicus yunnanesis; Pinus yunnanesis, host location, behavior, green leaf volatiles