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

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

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...