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J Chem Ecol

Title:		Attraction to herbivore-induced plant volatiles by the host-foraging parasitoid fly Exorista japonica
Author(s):		Ichiki RT; Kainoh Y; Kugimiya S; Takabayashi J; Nakamura S;
Address:		"Japan International Research Center for Agricultural Sciences, Ohwashi 1-1, Tsukuba, Ibaraki 305-8686, Japan. richiki@mail.goo.ne.jp"
Journal Title:		J Chem Ecol
Year:		2008
Volume:		20080409
Issue:		5
Page Number:		614 - 621
DOI:		10.1007/s10886-008-9459-6
ISSN/ISBN:		0098-0331 (Print) 0098-0331 (Linking)
Abstract:		"Responses of the tachinid fly Exorista japonica Townsend to odors from corn plants infested with the fly's host, the larvae of the noctuid moth Mythimna separata (Walker), were examined in a wind tunnel. Naive female flies showed a higher rate of landing on M. separata-infested corn plants from which the host larvae had been removed than on artificially damaged or intact corn plants. When paper impregnated with a solution of headspace volatiles collected from host-infested plants was attached to intact plants, females landed on the plants at a high rate. Females also responded to intact plants to which had been attached with paper impregnated with a synthetic blend of nine chemicals identified previously in host-infested plants. There was an optimum concentration of the synthetic blend for the females' landing. Of the nine chemicals identified previously, four [(E)-4,8-dimethyl-1,3,7-nonatriene, indole, 3-hydroxy-2-butanone, and 2-methyl-1-propanol] released only by host-infested plants were classified as a host-induced blend. The other five [(Z)-3-hexen-1-yl acetate, (E)-2-hexenal, hexanal, (Z)-3-hexen-1-ol, and linalool] were classified as a non-specific blend released not only by infested plants but also by artificially damaged or intact plants. In the wind tunnel, E. japonica females did not respond to intact plants to which paper containing a solution of non-specific blend or host-induced blend was attached. However, they showed a high level of response to a mixture of the non-specific and host-induced blends. These results indicate that naive E. japonica use a combination of non-specific and host-induced blends as an olfactory cue for locating host-infested plants"
Keywords:		Animals Biological Assay Diptera/*physiology Feeding Behavior Female Volatilization Zea mays/*parasitology;
Notes:		"MedlineIchiki, Ryoko T Kainoh, Yooichi Kugimiya, Soichi Takabayashi, Junji Nakamura, Satoshi eng Research Support, Non-U.S. Gov't 2008/04/10 J Chem Ecol. 2008 May; 34(5):614-21. doi: 10.1007/s10886-008-9459-6. Epub 2008 Apr 9"