Olfactory responses of Ips duplicatus from inner Mongolia, China to nonhost leaf and bark volatiles

Citation
Qh. Zhang et al., Olfactory responses of Ips duplicatus from inner Mongolia, China to nonhost leaf and bark volatiles, J CHEM ECOL, 27(5), 2001, pp. 995-1009
Citations number
43
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
27
Issue
5
Year of publication
2001
Pages
995 - 1009
Database
ISI
SICI code
0098-0331(200105)27:5<995:OROIDF>2.0.ZU;2-W
Abstract
Leaf and bark volatiles from nonhost angiosperm trees were tested on lps du plicatus by gas chromatographic-electroantennographic detection (GC-EAD) an d by pheromone-baited traps in Sweden and Inner Mongolia, China, respective ly. GC-EAD analysis of the headspace volatiles from fresh bark chips of Bet ula pubescens revealed trans-conophthorin, two green leaf Volatiles (GLVs): 1-hexanol and (Z)-3-hexen-1-ol, and two Cs alcohols: 3-octanol and 1-octen -3-ol, that consistently elicited antennal responses by I. duplicatus. The identification of these EAD-active compounds was confirmed in further GC-EA D recordings with synthetic mixtures. Antennal responses were also found to synthetic (E)-2-hexen-1-ol and linalool, which have been identifed from th e leaves of nonhost birch and aspen species. No antennal responses of I. du plicatus were found to hexanal, (E)-2-hexenal, and (Z)-3-hexyl acetates. In field trapping experiments, blends of EAD-active green leaf alcohols or C- 8 alcohols, or trans-conophthorin alone resulted in significant reductions (27-60%) in the number of I. duplicatus captured compared with pheromone-ba ited traps. The unsuitable host compound, verbenone (Vn), also significantl y reduced trap catches by up to 60% in both experiments. The strongest disr uptive effect resulted from the addition of the combination of green leaf a lcohols, C-8 alcohols, and verbenone to the pheromone trap, which caused an 84% reduction in trap catch. The blend of two green leaf aldehydes plus th e acetate increased the trap catches in 1998 and had no negative or positiv e effects in 1999. Our results suggest that these nonhost volatiles (NHVs) are important olfactory signals used by I. duplicatus in host selection. Th ey may have great significance in developing semiochemical-based management programs for I. duplicatus by reducing or stopping attacks on suitable hos ts.