Journal
PEST MANAGEMENT SCIENCE
Volume 78, Issue 5, Pages 1992-1999Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.6819
Keywords
Coleoptera: Curculionidae: Scolytinae; repellent; (1R,4S)-(+)-trans-4-thujanol; sabinene hydrate; dose-response; oxygenated terpene; integrated pest management
Categories
Funding
- grant 'Building up an excellent scientific team and its spatiotechnical background focused on mitigation of the impact of climatic changes to forests from the level of a gene to the level of a landscape at the FFWS CULS Prague' - OP RDE [CZ.02.1.01/0.0/0.0/15_003/0000433]
- Slovak Research and Development Agency [APVV-15-0761]
- Linnaeus University, Sweden
- Carl Trygger Foundation
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Norway spruce volatile (+)-trans-4-thujanol is a novel I. typographus anti-attractant with potency comparable to the known anti-attractants 1,8-cineole and verbenone, and is more effective for females than for males. Incorporating (+)-trans-4-thujanol into anti-attractant lures could improve protection of trees from mass attack by I. typographus.
BACKGROUND: Eurasian spruce bark beetles (Ips typographus) use both attractant and anti-attractant semiochemicals to find suitable mature host trees. Trans-4-thujanol is abundant in young, unsuitable spruce trees. Electrophysiological studies have demonstrated its high activity levels, but field data are lacking. RESULTS: Enantioselective GC-MS analysis showed that only (1R,4S)-(+)-trans-4-thujanol was present in Norway spruce bark volatiles. In a factorial design field-trapping experiment, trans-4-thujanol alone was not attractive to Ips typographus. Traps baited with I. typographus' aggregation pheromone and trans-4-thujanol or the known anti-attractant 1,8-cineole caught fewer beetles than those baited with the aggregation pheromone alone. Catches for trans-4-thujanol and 1,8-cineole were dosedependent. Intermediate doses of trans-4-thujanol and 1,8-cineole had a similar effect. Surprisingly, in contrast to 1,8-cineole and other known Ips anti-attractants, which all inhibit males more strongly than females, the addition of trans4-thujanol to the aggregation pheromone reduced the attraction of females more. CONCLUSION: The Norway spruce volatile (+)-trans-4-thujanol is a novel I. typographus anti-attractant with potency comparable to the known anti-attractants 1,8-cineole and verbenone, and is more effective for females than for males. Incorporating (+)-trans-4-thujanol into anti-attractant lures could improve protection of trees from mass attack by I. typographus. (C) 2022 Society of Chemical Industry.
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