Université de Neuchâtel

Population genetic structure of two primary parasitoids of Spodoptera frugiperda (Lepidoptera), Chelonus insularis and Campoletis sonorensis (Hymenoptera): to what extent is the host plant important?

Jourdie, Violaine ; Alvarez, Nadir ; Molina-Ochoa, Jaime ; Williams, Trevor ; Bergvinson, David ; Benrey, Betty ; Turlings, Ted C. J. ; Franck, Pierre

In: Molecular Ecology, 2010, vol. 19, no. 10, p. 2168-2179

Plant chemistry can strongly influence interactions between herbivores and their natural enemies, either by providing volatile compounds that serve as foraging cues for parasitoids or predators, or by affecting the quality of herbivores as hosts or prey. Through these effects plants may influence parasitoid population genetic structure. We tested for a possible specialization on specific crop...

Université de Neuchâtel

Isolation and characterization of polymorphic microsatellite loci in two primary parasitoids of the noctuid Spodoptera frugiperda: Chelonus insularis and Campoletis sonorensis (Hymenoptera)

Jourdie, Violaine ; Alvarez, Nadir ; Turlings, Ted C. J. ; Franck, Pierre

In: Molecular Ecology Resources, 2008, vol. 9, no. 1, p. 171-173

Fifteen and 13 microsatellite loci were isolated, respectively, from Campoletis sonorensis Cameron and from Chelonus insularis Cresson. These two parasitic Hymenoptera are primary parasitoids of Lepidoptera in North, Central and South America, including the important agricultural pest Spodoptera frugiperda. Allelic diversity and heterozygosity were quantified in samples from...

Université de Neuchâtel

Identification of seven species of hymenopteran parasitoids of Spodoptera frugiperda, using polymerase chain reaction amplification and restriction enzyme digestion

Jourdie, Violaine ; Alvarez, Nadir ; Turlings, Ted C. J.

In: Agricultural and Forest Entomology, 2008, vol. 10, no. 2, p. 129-136

1 The fall armyworm Spodoptera frugiperda is a voracious pest of numerous crops of economic importance throughout the New World. In its native Mexico, larvae can be attacked by several species of parasitic wasps, which are candidate biological control agents against this and other lepidopteran pests. 2 We attempted to survey the parasitoid fauna on S. frugiperda in maize and...

Université de Neuchâtel

Parasotoid communities and genetic structure : host plant does not matter

Jourdie, Violaine ; Turlings, Ted (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th. 2050.

Plant-insect interactions have long been studied and reveal intricate mechanisms. Plants are capable of defending themselves both directly by poisoning insect herbivores and indirectly by emitting volatile compounds that are used by the natural enemies to localize their host. In response, insects have evolved strategies to defeat plant defense mechanisms. Because insect pests are affected by...

Université de Neuchâtel

Priming by airborne signals boosts direct and indirect resistance in maize

Ton, Jurriaan ; D'Alessandro, Marco ; Jourdie, Violaine ; Jakab, Gabor ; Karlen, Danielle ; Held, Matthias ; Mauch-Mani, Brigitte ; Turlings, Ted C. J.

In: The Plant Journal, 2007, vol. 49, no. 1, p. 16-26

Plants counteract attack by herbivorous insects using a variety of inducible defence mechanisms. The production of toxic proteins and metabolites that instantly affect the herbivore's development are examples of direct induced defence. In addition, plants may release mixtures of volatile organic compounds (VOCs) that indirectly protect the plant by attracting natural enemies of the herbivore....