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

Odour-mediated long-range avoidance of interspecific competition by a solitary endoparasitoid : a time-saving foraging strategy

Tamò, Cristina ; Roelfstra, Lise-Lore ; Guillaume, Suzanne ; Turlings, Ted C. J.

In: Journal of Animal Ecology, 2006, vol. 75, no. 5, p. 1091–1099

1. In studies on optimal foraging strategies, long-range decisions in the pursuit of resource are rarely considered. This is also the case for sympatric parasitoids, which may be confronted with the decision to accept or reject host larvae that are already parasitized by a competing species. They can be expected to reject already parasitized hosts if it is likely that they will lose the...

Université de Neuchâtel

A comparison of naïve and conditioned responses of three generalist endoparasitoids of lepidopteran larvae to host-induced plant odours

Tamò, Cristina ; Ricard, Ingrid ; Held, Matthias ; Davison, A. C. ; Turlings, Ted C. J.

In: Animal Biology, 2006, vol. 56, p. 205-220

Many parasitic wasps that exploit herbivores as their hosts make use of herbivoreinduced plant odours to locate their victims and these wasps often exhibit an ability to learn to associate specific plant-produced odours with the presence of hosts. This associative learning is expected to allow generalist parasitoids to focus on cues that are most reliably associated with current host presence,...

Université de Neuchâtel

Differential Attractiveness of Induced Odors Emitted by Eight Maize Varieties for the Parasitoid Cotesia marginiventris : Is Quality or Quantity Important ?

Hoballah, Maria Elena ; Tamò, Cristina ; Turlings, Ted C. J.

In: Journal of Chemical Ecology, 2002, vol. 28, p. 951 - 968

Herbivore-induced plant volatiles can function as indirect defense signals that attract natural enemies of herbivores. Several parasitoids are known to exploit these plant-provided cues to locate their hosts. One such parasitoid is the generalist Cotesia marginiventris, which is, among others, attracted to maize volatiles induced by caterpillar damage. Maize plants can be induced to...

Université de Neuchâtel

A six-arm olfactometer permitting simultaneous observation of insect attraction and odour trapping

Turlings, Ted C. J. ; Davison, A. C. ; Tamò, Cristina

In: Physiological Entomology, 2004, vol. 29, p. 45-55

Behavioural assays to study insect attraction to specific odours are tedious, time consuming and often require large numbers of replications. Olfactometer and flight tunnel tests can usually only be conducted with one or two odour sources at a time. Moreover, chemical information on the odour sources has to be obtained in separate analytical studies. An olfactometer was developed in which six...