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

Modification of plant resistance and metabolism by above- and belowground herbivores

Erb, Matthias ; Turlings, Théodor (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2084.

Plants are often attacked by above- and belowground herbivores. As a result, they have evolved defense mechanisms to protect both their roots and shoot. However, physiological processes in roots and shoots are tightly connected, and attack of one of these plant parts can dramatically alter primary and secondary metabolism of the other (chapter 1). It is therefore important to understand how the...

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

An elicitor in caterpillar oral secretions that induces corn seedlings to emit chemical signals attractive to parasitic wasps

Turlings, Ted C. J. ; McCall, Philip J. ; Alborn, Hans ; Tumlinson, James H.

In: Journal of Chemical Ecology, 1993, vol. 19, p. 411 - 425

Regurgitate of corn-fed beet armyworm (BAW) caterpillars, Spodoptera exigua, when applied to damaged sites of corn (Zea mays) seedlings, causes the release of relatively large amounts of terpenes by the seedlings several hours later. This plant response could be induced by merely placing the cut stem of seedlings in a solution of BAW regurgitate for 12 hr, a response that could not...

Université de Neuchâtel

Isolation and identification of allelochemicals that attract the larval parasitoid, Cotesia marginiventris (Cresson), to the microhabitat of one of its hosts

Turlings, Ted C. J. ; Tumlinson, James H. ; Heath, Robert R. ; Proveaux, Adron T. ; Doolittle, Robert E.

In: Journal of Chemical Ecology, 1991, vol. 17, p. 2235-2250

Volatiles released from corn seedlings on which beet armyworm larvae were feeding were attractive to females of the parasitoid, Cotesia marginiventris (Cresson), in flight tunnel bioassays. Analyses of the collected volatiles revealed the consistent presence of 11 compounds in significant amounts. They were: (Z)-3-hexenal, (E)-2-hexenal, (Z)-3-hexen-1-ol, (Z)- 3-hexen-1-yl acetate,...