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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

High Genetic Variability of Herbivore-Induced Volatile Emission within a Broad Range of Maize Inbred Lines

Degen, Thomas ; Dillmann, Christine ; Marion-Poll, Frédéric ; Turlings, Ted C. J.

In: Plant Physiology, 2004, vol. 135, no. 4, p. 1928-1938

Maize plants (Zea mays) attacked by caterpillars release a mixture of odorous compounds that attract parasitic wasps, natural enemies of the herbivores. We assessed the genetic variability of these induced volatile emissions among 31 maize inbred lines representing a broad range of genetic diversity used by breeders in Europe and North America. Odors were collected from young plants that...

Université de Neuchâtel

Occurrence and direct control potential of parasitoids and predators of the fall armyworm (Lepidoptera: Noctuidae) on maize in the subtropical lowlands of Mexico

Hoballah, Maria Elena ; Degen, Thomas ; Bergvinson, David ; Savidan, Anita ; Tamò, Cristina ; Turlings, Ted C. J.

In: Agricultural and Forest Entomology, 2004, vol. 6, no. 1, p. 83-88

1 Native natural enemies have the potential to control fall armyworm Spodoptera frugiperda (Smith) in tropical maize grown in Mexico, where this insect pest causes severe economic losses to farmers. It has been proposed that enhancing herbivore-induced volatile emissions in maize plants may help to increase the effectiveness of natural enemies, which use these volatiles to locate...

Université de Neuchâtel

Evaluating the Induced-Odour Emission of a Bt Maize and its Attractiveness to Parasitic Wasps

Turlings, Ted C. J. ; Jeanbourquin, Philippe M. ; Held, Matthias ; Degen, Thomas

In: Transgenic Research, 2005, vol. 14, p. 807-816

The current discussion on the safety of transgenic crops includes their effects on beneficial insects, such as parasitoids and predators of pest insects. One important plant trait to consider in this context is the emission of volatiles in response to herbivory. Natural enemies use the odours that result from these emissions as cues to locate their herbivorous prey and any significant change in...

Université de Neuchâtel

Variability in herbivore-induced odour emissions among maize cultivars and their wild ancestors (teosinte)

Gouinguené, Sandrine ; Degen, Thomas ; Turlings, Ted C. J.

In: Chemoecology, 2001, vol. 1, p. 9-16

Maize plants respond to caterpillar feeding with the release of relatively large amounts of specific volatiles, which are known to serve as cues for parasitoids to locate their host. Little is known about the genetic variability in such herbivore-induced plant signals and about how the emissions in cultivated plants compare to those of their wild relatives. For this reason we compared the total...