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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...

Université de Neuchâtel

Strong Attraction of the Parasitoid Cotesia marginiventris Towards Minor Volatile Compounds of Maize

D’Alessandro, Marco ; Brunner, Virginie ; von Mérey, Georg ; Turlings, Ted C. J.

In: Journal of Chemical Ecology, 2009, vol. 35, no. 9, p. 999-1008

Plants infested with herbivorous arthropods emit complex blends of volatile compounds, which are used by several natural enemies as foraging cues. Despite detailed knowledge on the composition and amount of the emitted volatiles in many plant-herbivore systems, it remains largely unknown which compounds are essential for the attraction of natural enemies. In this study, we used a combination of...

Université de Neuchâtel

The nutritional value of aphid honeydew for non-aphid parasitoids

Faria, Cristina A. ; Wäckers, Felix L. ; Turlings, Ted C. J.

In: Basic and Applied Ecology, 2008, vol. 9, no. 3, p. 286-297

Intake of sugar-rich foods by adult parasitoids is crucial for their reproductive success. Hence, the availability of suitable foods should enhance the efficacy of parasitoids as biological control agents. In situations where nectar is not readily available, homopteran honeydew can be a key alternative food source. We studied the impact of honeydew feeding on the longevity of the larval...

Université de Neuchâtel

Fungal Infection Reduces Herbivore-Induced Plant Volatiles of Maize but does not Affect Naïve Parasitoids

Rostás, Michael ; Ton, Jurriaan ; Mauch-Mani, Brigitte ; Turlings, Ted C. J.

In: Journal of Chemical Ecology, 2006, vol. 32, no. 9, p. 1897-1909

Plants attacked by insects release volatile compounds that attract the herbivores' natural enemies. This so-called indirect defense is plastic and may be affected by an array of biotic and abiotic factors. We investigated the effect of fungal infection as a biotic stress agent on the emission of herbivore-induced volatiles and the possible consequences for the attraction of two parasitoid...

Université de Neuchâtel

The Role of Indole and Other Shikimic Acid Derived Maize Volatiles in the Attraction of Two Parasitic Wasps

D'Alessandro, Marco ; Held, Matthias ; Triponez, Yann ; Turlings, Ted C. J.

In: Journal of Chemical Ecology, 2006, vol. 32, no. 2, p. 2733-2748

After herbivore attack, plants release a plethora of different volatile organic compounds (VOCs), which results in odor blends that are attractive to predators and parasitoids of these herbivores. VOCs in the odor blends emitted by maize plants (Zea mays) infested by lepidopteran larvae are well characterized. They are derived from at least three different biochemical pathways, but the...