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J Chem Ecol

Title:		Odors Attracting the Long-Legged Predator Medetera signaticornis Loew to Ips typographus L. Infested Norway Spruce Trees
Author(s):		Sousa M; Birgersson G; Karlsson Green K; Pollet M; Becher PG;
Address:		"Unit of Chemical Ecology, Department of Plant Protection Biology, Swedish University of Agricultural Sciences, P.O. Box 190, SE 234 22, Lomma, Sweden. maria.sousa@slu.se. Unit of Chemical Ecology, Department of Plant Protection Biology, Swedish University of Agricultural Sciences, P.O. Box 190, SE 234 22, Lomma, Sweden. Research Institute for Nature and Forest (INBO), Herman Teirlinckgebouw, Havenlaan 88, bus 73, B-1000, Brussels, Belgium"
Journal Title:		J Chem Ecol
Year:		2023
Volume:		20230131
Issue:
Page Number:		-
DOI:		10.1007/s10886-023-01405-6
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:		"Predatory long-legged flies of the genus Medetera are important, but currently understudied, natural enemies of Scolytinae bark beetles such as Ips typographus. Medetera flies lay eggs on beetle-infested trees, where the developing larvae find their prey, but the chemical cues used by Medetera to locate infested trees are currently unknown. To identify odors attracting Medetera signaticornis, a species in Europe, headspace samples were collected at several time-points through different stages of I. typographus attacks on logs of Norway spruce (Picea abies). The headspace samples were analyzed using combined gas chromatography and mass spectrometry (GC-MS), and gas chromatography coupled with electroantennographic detection (GC-EAD) to determine compounds that stimulate M. signaticornis antennae. Antennae of M. signaticornis males and females were found to detect (-)-cis-verbenol, ( +)-trans-verbenol and myrtenol, which are known to be produced by bark beetles. Antennal responses were also observed for verbenene, isoterpinolene, alpha-pinene oxide, camphor, pinocamphone, terpinene-4-ol, myrtenal, borneol, alpha-terpineol, geranyl acetone, and verbenone, which are primarily produced by microorganisms, and alpha-pinene, alpha-fenchene, beta-pinene, camphene, 3-carene, limonene, gamma-terpinene, and terpinolene, known spruce tree compounds. In field experiments testing two synthetic blends containing 18 antennal active and two additional compounds 2-methyl-3-buten-2-ol and ipsdienol we observed significant attraction of M. signaticornis within 24 h. These attractive blends can form the basis for development of Medetera monitoring lures for use in future forest and pest management"
Keywords:		Biocontrol Electrophysiology Host location Kairomone Predator-prey interaction Sustainable forestry;
Notes:		"PublisherSousa, Maria Birgersson, Goran Karlsson Green, Kristina Pollet, Marc Becher, Paul G eng 2023/01/31 J Chem Ecol. 2023 Jan 31. doi: 10.1007/s10886-023-01405-6"