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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (4): 132-138.doi: 10.11707/j.1001-7488.LYKX20220054

• Research papers • Previous Articles     Next Articles

Toxicity and Behavioral Regulatory Effects of Monoterpenes in Picea koraiensis to the Bark BeetleIps typographus (Coleoptera: Scolytidae)

Jiaxing Fang1(),Yue Wang2,Mei Deng3,Chunmei Yu3,Fu Liu1,Sufang Zhang1,Zhen Zhang1,Xiangbo Kong1,*   

  1. 1. Key Laboratory of Forest Protection of National Forestry and Grassland Administration Ecology and Nature Conservation Institute, Chinese Academy of Forestry Beijing 100091
    2. Center for Biological Disaster Prevention and Control, National Forestry and Grassland Administration Shenyang 110034
    3. Forest Diseases and Pest Control and Quarantine General Station of Qinghai Province Xining 810007
  • Received:2022-02-05 Online:2023-04-25 Published:2023-07-05
  • Contact: Xiangbo Kong E-mail:fjxinsect@163.com

Abstract:

Objective: In this study, we analyzed the differences in the release of monoterpenes from the trunk of healthy and weak Picea koraiensis, evaluated their fumigation toxicity to adult of Ips typographus, and tested their synergistic and antogonistic effects on aggregation pheromones of the bark beetle. Based on these investigation, we aims to produce efficient semiochemicals for population regulation of I. typographus in the forest. Method: Dynamic headspace sampling was used to collect the volatiles released from the stem of healthy and weak P. koraiensis. Gas chromatography was used to qualitatively and quantitatively analyze the monoterpenes. The toxicity of the monoterpenes against adult I. typographus was determined by using the headspace fumigation method, and the behavioral effects of the monoterpenes on I. typographus and its natural enemy, Thanasimus substriatus(Coleoptera: Cleridae) were analyzed in the forest. Result: The major monoterpenes from the trunk ofP. koraiensis were identified, including S-(–)-α-pinene, R-(+)-α-pinene, S-(–)-β-pinene, myrcene, 3-carene, (–)-limonene, and (+)-limonene. The total amount of monoterpenes in healthy stems was significantly higher than that in weakened stems, while the release amount of R-(+)-α-pinene and (+)-limonene showed no significant difference between healthy and weakened stems. The LC50 values of seven monoterpenes against I. typographus ranged from 3.10–4.50 μL?mL?1, with (+)-limonene showing the strongest toxicity. There were significant differences in LC50 values among the seven monoterpenes, but not between male and female adult beetles. The field behavioral test showed that 3-carene, (–)-limonene, and (+)-limonene significantly reduced the trap catches of I. typographus by aggregation pheromones, but S-(–)-β-pinene showed no effect on the trap catches. Compared to (–)-limonene and (+)-limonene, 3-carene was able to significantly improve the trap catches of the predator T. substriatusby aggregation pheromones. Conclusion: The trunk of P. koraiensis can release seven major monoterpenes. The weakened spruce, suitable for colonization byI. typographus, releases less monoterpenes than the healthy spruce. These monoterpenes have fumigation toxicity against I. typographus and may be involved in regulating tritrophic relationships between spruce, I. typographus, and T. substriatus. Limonene can be used as a repellent for ecological prevention and control of I. typographus.

Key words: Ips typographus, Picea koraiensis, monoterpene, fumigation toxicity, behavioral regulation

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