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Université de Neuchâtel

Combined use of herbivore-induced plant volatiles and sex pheromones for mate location in braconid parasitoids

Xu, Hao ; Desurmont, Gaylord ; Degen, Thomas ; Zhou, Guoxin ; Laplanche, Diane ; Henryk, Luka ; Turlings, Ted C.J

In: Plant, Cell and Environment, 2017, vol. 40, no. 3, p. 330-339

Herbivore-induced plant volatiles (HIPVs) are important cues for female parasitic wasps to find hosts. Here, we investigated the possibility that HIPVs may also serve parasitoids as cues to locate mates. To test this, the odour preferences of four braconid wasps – the gregarious parasitoid Cotesia glomerata (L.) and the solitary parasitoids Cotesia marginiventris (Cresson),...

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

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

Does the invasive horse-chestnut leaf mining moth, Cameraria ohridella, affect the native beech leaf mining weevil, Orchestes fagi, through apparent competition?

Péré, Christelle ; Bell, Robert ; Turlings, Ted C. J. ; Kenis, Marc

In: Biodiversity and Conservation, 2011, vol. 20, no. 13, p. 3003-3016

Apparent competition, through the action of shared natural enemies, is frequently suggested as a possible mechanism underlying the impact of invasive alien species on native species, but examples are rare, particularly in insects. A previous study showed that the beech leaf mining weevil, Orchestes fagi, was significantly less abundant close to horse-chestnut trees infested by the invasive...

Université de Neuchâtel

Signal signature of aboveground-induced resistance upon belowground herbivory in maize

Erb, Matthias ; Flors, Victor ; Karlen, Danielle ; de Lange, Elvira S. ; Planchamp, Chantal ; D’Alessandro, Marco ; Turlings, Ted C. J. ; Ton, Jurriaan

In: The Plant Journal, 2009, vol. 59, no. 2, p. 292-302

Plants activate local and systemic defence mechanisms upon exposure to stress. This innate immune response is partially regulated by plant hormones, and involves the accumulation of defensive metabolites. Although local defence reactions to herbivores are well studied, less is known about the impact of root herbivory on shoot defence. Here, we examined the effects of belowground infestation by...

Université de Neuchâtel

The role of abscisic acid and water stress in root herbivore-induced leaf resistance

Erb, Matthias ; Köllner, Tobias G. ; Degenhardt, Jörg ; Zwahlen, Claudia ; Hibbard, Bruce E. ; Turlings, Ted C. J.

In: New Phytologist, 2011, vol. 189, no. 1, p. 308-320

Herbivore-induced systemic resistance occurs in many plants and is commonly assumed to be adaptive. The mechanisms triggered by leaf-herbivores that lead to systemic resistance are largely understood, but it remains unknown how and why root herbivory also increases resistance in leaves. To resolve this, we investigated the mechanism by which the root herbivore Diabrotica...

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