Chemical characterization of contact semiochemicals for host-recognition and host-acceptance by the specialist parasitoid Cotesia plutellae (Kurdjumov)

Roux Olivier, Gers Charles, Tene-Ghomsi Josèphe Nathan, Arvanitakis Laurence, Bordat Dominique, Legal Luc. 2007. Chemical characterization of contact semiochemicals for host-recognition and host-acceptance by the specialist parasitoid Cotesia plutellae (Kurdjumov). Chemoecology, 17 (1) : 13-18.

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Cotesia plutellae is a specialist parasitoid of Plutella xylostella. This specificity is potentially under the control of several factors before and after oviposition. Thereby, the stimuli that lead female parasitoids to host locations and to oviposition, might be at the basis of the specificity. We explore here the response of C. plutellae females exposed to host cuticular lipids. A total cuticular lipid extract of host caterpillars was fractionated into a hydrocarbon fraction and a non-hydrocarbon fraction. Neither fraction alone had any effect on oviposition behaviour in C. plutellae but the hydrocarbon fraction alone did seem to have a positive effect on the rate of antennal contact by the females. To induce oviposition behaviour, both fractions were necessary and reflect cooperation between at least one compound in each fraction. Identification of cuticular lipids shows that hydrocarbons were dominant (77%). Non-hydrocarbon compounds were mainly represented by 15-nonacosanone (18% of the total lipid extract). This ketone is rare in insect cuticle lipids and is thought to originate from the cabbage epicuticle where it is dominant with n-C29 and 14- and 15-nonacosanol also found among the cuticular lipids of the host caterpillar.

Mots-clés Agrovoc : Cotesia plutellae, Plutella xylostella, lipide, cuticule animale, relation hôte parasite, parasitoïde, substance sémiochimique

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Roux Olivier, Université Toulouse III Paul Sabatier (FRA)
• Gers Charles, Université Toulouse III Paul Sabatier (FRA)
• Tene-Ghomsi Josèphe Nathan, ENFA (FRA)
• Arvanitakis Laurence, CIRAD-FLHOR-UPR Horticulture (FRA)
• Bordat Dominique, CIRAD-FLHOR-UPR Horticulture (FRA)
• Legal Luc, Université Toulouse III Paul Sabatier (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/537824/)

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