Acta Entomologica Sinica (2008) 51, 580-585

Xue-Mei Zhang, Cheng-Ju Wang, Xiang-Bo Kong, Zhen Zhang and Hong-Bin Wang (2008)
[Identification of the stereoisomers of pheromone candidates of Dendrolimus houi (Lepidoptera : Lasiocampidae) with Kováts indexes]
Acta Entomologica Sinica 51 (6), 580-585
Abstract: Kováts indexes (KIs) of pheromone candidates of Dendrolimus houi Lajonquière, using n-alkanes as reference series, were calculated on temperature programmed capillary column DB-WAX and DB-5, which was applied to identify pheromone components in extracts of pheromone glands of D. houi. Use of Kovats retention indexes, particularly in combination with high resolution gas chromatography-mass spectrometry (GC-MS), can provide substantial information about the stereochemistry assignment of unknowns, especially when those standards of all possible structures are not available for comparison or only trace amounts of the unknowns available. Furthermore, because Kls are highly reproducible, the procedure looks to be a promising method for differentiation and identification of isomeric pheromone components. In this paper, the stereoisomers of pheromone candidates of D. houi were elucidated to have E5 + Z7 geometrical isomers using the method of KIs-GC-MS. In addition, some practical and accuracy aspects of KIs are discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)

Research topic(s) for pests/diseases/weeds:
pheromones/attractants/traps

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Dendrolimus houi