Behavioural response of the woodwasp Sirex noctilio to volatile emissions of its fungal symbiont

Authors
Fernandez Ajo, Alejandro Apolo; Martinez Von Ellrich, Andres; Villacide, Jose Maria; Corley, Juan Carlos
Publication Year
2015
Language
English
Format
article
Status
Published version
Description
The wood-boring wasp, Sirex noctilio, is a global invasive pest that infects and kills pine trees by inoculating spores of a symbiotic fungus (Amylostereum areolatum) at oviposition. Wasp larvae depend on fungal growth to feed, while the fungus relies on female wasps to initially condition the pine tree by inoculating a phytotoxic venom and for dispersal. Wasp larvae use the fungus as an external gut for the digestion of lignocellulosic compounds resulting in a strong correlation between fungal growth inside the wood and wasp fitness. This study explores the hypothesis that female wasps will use fungal volatiles as a synomone in the process of locating suitable oviposition areas (i.e. trees). Using a Y-tube olfactometer, adult female wasp behaviour was assessed towards fungal and pine tree volatiles (i.e. positive control). Our results are the first to demonstrate attraction of female S. noctilio towards volatiles of their fungal symbiont. Furthermore, the positive response towards these volatiles seems to be stronger than the response to a known attractant (i.e. pine volatiles). These results could be an important contribution to improving baits for monitoring and control purposes. Further work is needed, mainly oriented towards the identification of the volatiles that trigger the observed attraction response and their possible synergistic effects with tree volatiles.
Fil: Fernandez Ajo, Alejandro Apolo. INTA. Estación Experimental Agropecuaria Bariloche. Grupo de Ecología de Poblaciones de Insectos; Argentina
Fil: Martinez Von Ellrich, Andres. INTA. Estación Experimental Agropecuaria Bariloche. Grupo de Ecología de Poblaciones de Insectos; Argentina
Fil: Villacide, Jose Maria. INTA. Estación Experimental Agropecuaria Bariloche. Grupo de Ecología de Poblaciones de Insectos; Argentina
Fil: Corley, Juan Carlos. INTA. Estación Experimental Agropecuaria Bariloche. Grupo de Ecología de Poblaciones de Insectos; Argentina
Source
Journal of applied entomology 139 (9) : 654-659. (November 2015)
Subject
Sirex
Simbiontico
Insectos Perforadores de la Madera
Comportamiento Animal
Hymenoptera
Gestión de Lucha Integrada
Hongos
Symbionts
Timber Boring Insects
Animal Behaviour
Integrated Pest Management
Fungi
Sirex Noctilio
Access level
Open access
License
Repository
INTA Digital (INTA)
Institution
Instituto Nacional de Tecnología Agropecuaria
OAI Identifier
oai:localhost:20.500.12123/1276