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Optimizing the attractiveness of pheromone baits used for trapping the four-eyed spruce bark beetle Polygraphus poligraphus
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
SLU, Uppsala .
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2019 (English)In: Journal of applied entomology, ISSN 0931-2048, E-ISSN 1439-0418, Vol. 143, no 7, p. 721-730Article in journal (Refereed) Published
Abstract [en]

Bark beetles have caused extensive damage to forests in central Sweden during the past decade, and the four-eyed spruce bark beetle, Polygraphus poligraphus, seems to be involved. However, its role in these bark beetle outbreaks is still not clear. The purpose of this study was to develop an efficient pheromone bait for P. poligraphus, which would make it possible to study the species more carefully and thereby contribute to protect exposed forests in an environmentally friendly way. Three field studies were conducted in 2015, 2016 and 2018 in Medelpad, county of Västernorrland, Sweden. The pheromone of P. poligraphus, (−)-terpinen-4-ol, was tested at different release rates and in different enantiomeric purities, to find the most attractive formulation for the beetles. It was also tested in combination with racemic frontalin, a compound which has previously been shown to produce a synergistic effect together with (−)-terpinen-4-ol of low enantiomeric purity; 52% ee. Other compounds, chosen based on responses from electroantennographic studies, were also tested in an attempt to find additional attractants and repellents for P. poligraphus. The most attractive treatment tested was enantiomerically pure (−)-terpinen-4-ol (99% ee). When the enantiomeric purity was lower (50% ee), the trap catches was lowered to levels comparable to the catches for unbaited control traps. A strong synergistic effect with frontalin was observed for (−)-terpinen-4-ol of low enantiomeric purity (50% ee) but not for the enantiomerically pure compound (99% ee). The release rate of (−)-terpinen-4-ol (99% ee) was shown to be an important factor. For the combination of frontalin and (−)-terpinen-4-ol (50% ee), the attraction seemed strongest when (−)-terpinen-4-ol was released at a higher rate than frontalin. An interesting and novel result was that a repellent compound, α-terpineol, was identified in our studies. Our results from field studies and electroantennography recordings also indicate that (+)-terpinen-4-ol is a repellent for P. poligraphus.

Place, publisher, year, edition, pages
2019. Vol. 143, no 7, p. 721-730
Keywords [en]
enantiomers, field study, frontalin, pheromone, synergism, terpinen‐4‐ol
Identifiers
URN: urn:nbn:se:miun:diva-36659DOI: 10.1111/jen.12641ISI: 000475465300003OAI: oai:DiVA.org:miun-36659DiVA, id: diva2:1335939
Available from: 2019-07-08 Created: 2019-07-08 Last updated: 2019-08-14Bibliographically approved
In thesis
1. Structure elucidation of semiochemicals related to: Polygraphus poligraphus, Polygraphus punctifrons, Trioza apicalis, Whittleia retiella, Neodiprion edulicolus, Neodiprion scutellatus, Neodiprion knereri and Neodiprion virginianus
Open this publication in new window or tab >>Structure elucidation of semiochemicals related to: Polygraphus poligraphus, Polygraphus punctifrons, Trioza apicalis, Whittleia retiella, Neodiprion edulicolus, Neodiprion scutellatus, Neodiprion knereri and Neodiprion virginianus
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2019. p. 60
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 293
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-36850 (URN)978-91-88527-88-2 (ISBN)
Public defence
2019-03-12, O102, Sundsvall, 10:15 (English)
Supervisors
Note

Vid tidpunkten för disputationen var följande delarbeten opublicerade: delarbete 2 (accepterat), delarbete 3 (accepterat), delarbete 4 (inskickat), delarbete 5 (inskickat), delarbete 6 (manuskript).

At the time of the doctoral defence the following papers were unpublished: paper 2 (accepted), paper 3 (accepted), paper 4 (submitted), paper 5 (submitted), paper 6 (manuscript).

Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-08-16Bibliographically approved

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Viklund, LinaRahmani, RizanBång, JoakimHedenström, Erik

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