Semiochemical-mediated aggregation of the ambrosia beetle Trypodendron betulae (Coleoptera: Curculionidae: Scolytinae)

Porapak Q-captured volatiles from both sexes of Trypodendron betulae Swaine (Coleoptera: Curculionidae: Scolytinae) excised from newly attacked logs of paper birch, Betula papyrifera Marshall (Betulaceae), as well as volatiles from unattacked birch logs, were analysed by coupled gas chromatographic...

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Bibliographic Details
Published in:Canadian entomologist 2021-02, Vol.153 (1), p.91-102
Main Authors: Kühnholz, Susanne, Gries, Regine, Borden, John H.
Format: Article
Language:English
Subjects:
Agglomeration
Aggregation
Aggregation pheromone
Analytical methods
Animal behavior
Beetles
Betula papyrifera
Chromatography
Coleoptera
Curculionidae
Electroantennograms
Entomology
Ethanol
Experiments
Females
Gas chromatography
Identification
Insects
Linalool
Low density polyethylenes
Males
Mass spectroscopy
Pheromones
Polyethylene
Research Papers
Scolytinae
Sympatric populations
Trees
Trypodendron betulae
Volatile compounds
Volatiles
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Summary:Porapak Q-captured volatiles from both sexes of Trypodendron betulae Swaine (Coleoptera: Curculionidae: Scolytinae) excised from newly attacked logs of paper birch, Betula papyrifera Marshall (Betulaceae), as well as volatiles from unattacked birch logs, were analysed by coupled gas chromatographic electroantennographic detection analysis. Active compounds were identified by gas chromatographic mass spectroscopy. The enantiomeric ratio of 6-ethenyl-2,2,6-trimethyloxan-3-ol (linalool oxide pyranoid) was determined using a Cyclodex B column. Field-trapping experiments disclosed that the female-produced aggregation pheromone of T. betulae is a blend of the (3S,6R)-trans- and (3R,6R)-cis-linalool oxide pyranoid. Trap catches were synergistically increased when the pheromone was combined with both the host volatile ethanol and with conophthorin, which was found in female beetles as well as host volatiles. Use of linalool oxide pyranoid reproductively isolates T. betulae from sympatric Trypodendron Stephens species for which only (+)-lineatin has been identified as an aggregation pheromone.
ISSN:0008-347X
1918-3240
DOI:10.4039/tce.2019.81