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Pest Manag Sci

Title:		Oviposition substrate location by the invasive woodwasp Sirex noctilio: the combined effect of chemical cues emitted by its obligate symbiont Amylostereum areolatum and different host-tree species
Author(s):		Masague S; Fernandez PC; Devescovi F; Segura DF; De La Vega GJ; Corley JC; Villacide JM; Martinez AS;
Address:		"Grupo de Ecologia de Poblaciones de Insectos, Instituto de Investigaciones Forestales y Agropecuarias, Bariloche (INTA-CONICET), Rio Negro, Argentina. Facultad de Agronomia, Universidad de Buenos Aires, Buenos Aires, Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Buenos Aires, Argentina. Instituto de Genetica 'Ewald A. Favret' (INTA) - Grupo Vinculado al Instituto de Agrobiotecnologia y Biologia Molecular (IABIMO-CONICET), Buenos Aires, Argentina"
Journal Title:		Pest Manag Sci
Year:		2023
Volume:		20230622
Issue:		10
Page Number:		3959 - 3969
DOI:		10.1002/ps.7596
ISSN/ISBN:		1526-4998 (Electronic) 1526-498X (Linking)
Abstract:		"BACKGROUND: Sirex noctilio is an invasive forest wasp that affects pines and can result in severe economic losses. The use of semiochemicals offers an opportunity to develop sensitive and specific capturing systems to mitigatenegative impacts. Previous research showed that female S. noctilio would use volatiles emitted by its fungal symbiont, Amylostereum areolatum, but little is known about how these modulate behaviour when combined with pine-wood emissions. Our aim was to understand the relevance of fungal volatiles grown on artificial media and wood from two hosts trees, Pinus contorta and Pinus ponderosa, on behavioural and electroantennographic responses of wasp females. Because background odours can modify an insect's response towards resource-indicating semiochemicals, we propose that the behaviour towards the symbiont (resource) will be modulated by host pine emissions (background odours). RESULTS: Olfactometric assays showed that both host species with fungus were attractive when contrasted against air (P. contorta versus Air, chi(2) = 12.19, P < 0.001; P. ponderosa versus Air, chi(2) = 20.60, P < 0.001) and suggest a clear hierarchy in terms of female preferences towards the tested stimuli, with response highest towards the fungus grown on P. contorta (olfactory preference index: 5.5). Electrophysiological analyses indicate that females detect 62 volatile compounds from the tested sources. CONCLUSION: Results indicate a strong synergy between symbiont and host semiochemicals, suggesting that the pine species could play a fundamental role in the interaction. Further understanding of the chemical basis of this, could guide the development of specific and attractive lures, in order to maximize attraction of wasps in surveillance programmes. (c) 2023 Society of Chemical Industry"
Keywords:		Animals Female Trees Oviposition Cues Symbiosis *Wasps/physiology *Pinus background odours chemical ecology pest management resource indicating odours (RIOs) semiochemicals;
Notes:		"MedlineMasague, Santiago Fernandez, Patricia C Devescovi, Francisco Segura, Diego F De La Vega, Gerardo J Corley, Juan C Villacide, Jose M Martinez, Andres S eng PE-I074, PE-I033 and PD-I600 (Instituto Nacional de Tecnologia Agropecuaria)/ PICT Startup 2015-3864, (Agencia Nacional para la Promocion Cientifica y Tecnologica, Argentina)/ PUE-IFAB (Consejo Nacional de Investigaciones Cientificas y Tecnicas, Argentina)/ England 2023/06/05 Pest Manag Sci. 2023 Oct; 79(10):3959-3969. doi: 10.1002/ps.7596. Epub 2023 Jun 22"