Université de Neuchâtel

Exceptional Use of Sex Pheromones by Parasitoids of the Genus Cotesia : Males Are Strongly Attracted to Virgin Females, but Are No Longer Attracted to or Even Repelled by Mated Females

Xu, Hao ; Veyrat, Nathalie ; Degen, Thomas ; Turlings, Ted C.J

In: Insects, 2014, vol. 5, no. 3, p. 499-512

Sex pheromones have rarely been studied in parasitoids, and it remains largely unknown how male and female parasitoids locate each other. We investigated possible attraction (and repellency) between the sexes of two braconid wasps belonging to the same genus, the gregarious parasitoid, Cotesia glomerata (L.), and the solitary parasitoid, Cotesia marginiventris (Cresson). Males of...

Université de Neuchâtel

The role of indole in maize-herbivore interactions

Veyrat, Nathalie ; Turlings, Ted (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2014.

Afin de se protéger contre les attaques d’insectes herbivores, les plantes ont développé de multiples moyens de défense, dont la libération de composés volatils induits par les herbivores (HIPVs). Ces composés volatils peuvent être utilisés par les ennemis naturels des herbivores tels que les prédateurs et les parasitoïdes. D’autre part, ils peuvent être exploités par les...

Université de Neuchâtel

Minor effects of two elicitors of insect and pathogen resistance on volatile emissions and parasitism of Spodoptera frugiperda in Mexican maize fields

von Mérey, Georg ; Veyrat, Nathalie ; de Lange, Elvira S. ; Degen, Thomas ; Mahuku, George ; Lopez Valdez, Raymundo ; Turlings, Ted C. J. ; D’Alessandro, Marco

In: Biological Control, 2012, vol. 60, no. 1, p. 7-15

Synthetic elicitors can be used to induce resistance in plants against pathogens and arthropod herbivores. Such compounds may also change the emission of herbivore-induced plant volatiles, which serve as important cues for parasitic wasps to locate their hosts. Therefore, the use of elicitors in the field may affect biological control of insect pests. To test this, we treated maize seedlings...

Université de Neuchâtel

Dispensing synthetic green leaf volatiles in maize fields increases the release of sesquiterpenes by the plants, but has little effect on the attraction of pest and beneficial insects

von Mérey, Georg ; Veyrat, Nathalie ; Mahuku, George ; Lopez Valdez, Raymundo ; Turlings, Ted C. J. ; D’Alessandro, Marco

In: Phytochemistry, 2011, vol. 72, no. 14-15, p. 1838-1847

Maize plants respond to feeding by arthropod herbivores by producing a number of secondary plant compounds, including volatile organic compounds (VOCs). These herbivore-induced VOCs are not only known to attract natural enemies of the herbivores, but they may also prime inducible defences in neighbouring plants, resulting in stronger and faster defence responses in these VOC-exposed plants. Among...