Geoffrey Jaffuel

Research interests

Soil-dwelling insects can cause problematic damages to crops. In order to combat these pests, we plan to use polymer-based capsules as a novel and ecologically sound way to introduce biological control agents in soil. Polymer-based capsules can hold liquids and thus allow the encapsulation of entomopathogenic nematodes (EPN). In order to target pests, the capsule may contain pest’s attractants and feeding stimulants to lure the pests by deviating them from the plant to the capsule. An important aspect of my thesis will also be to identify active constituents of exudates from green pea roots that put nematodes in a state of quiescence, which may then be included in the capsule to improve nematode conservation issues. The final aim of this project is the massive production of capsules in order to be applied on crop fields to reduce pest pressure. In order to study the effect of encapsulated EPN, we will focus on their effect on the western corn rootworm (WCR) (Diabrotica virgifera virgifera) which is the most important pest of maize in the United States.



  1. Stelkens R. B., Jaffuel G., Escher M., Wedekind C. (2012). Genetic and phenotypic population divergence on a microgeographic scale in brown trout. Molecular Ecology.
  1. Purcell J, Avril A, Jaffuel G , Bates S, Chapuisat M (2014) Ant brood function as life preservers during floods. PLoS ONE. 9(2): e89211
  1. Hiltpold, I., Jaffuel, G., & Turlings, T. C. J. (2014). The dual effects of root-cap exudates on nematodes: from quiescence in plant-parasitic nematodes to frenzy in entomopathogenic nematodes. Journal of Experimental Botany
  1. Campos-herrera, R., Jaffuel, G., Chiriboga, X., Fesselet, M., Půža, V., Blanco-Pérez, R., Turlings, T.C.J (2014). Traditional and molecular detection methods reveal intense interguild competition and other multitrophic interactions associated with native entomopathogenic nematodes in Swiss tillage soils. Plant Soil. doi:10.1007/s11104-014-2358-4
  1. Kim, J., Jaffuel, G., & Turlings, T. C. J. (2014). Enhanced alginate capsule properties as a formulation of entomopathogenic nematodes. BioControl.
  1. Jaffuel, G., Hiltpold, I., Turlings, T. C. J. (2015) Highly potent extracts from Pea (Pisum sativum) and Maize (Zea mays) roots can be used to induced quiescence in Entomopathogenic nematodes. Journal of Chemical Ecology.
  1. Campos-Herrera, R., Půža V., Jaffuel G., Blanco-Pérez R., Čepulytė-Rakauskienė R., Turlings, T. C. J. (2015) Unraveling the intraguild competition between Oscheius spp. nematodes and entomopathogenic nematodes: Implications for their natural distribution in Swiss agricultural soils. Journal of Invertebrate Pathology.
  1. Jaffuel, G., Mäder, P., Blanco-perez, R., Chiriboga, X., Fliessbach, A., Turlings, T.C.J., Campos-herrera, R. (2016). Prevalence and activity of entomopathogenic nematodes and their antagonists in soils that are subject to different agricultural practices. Agriculture Ecosystems Environment
  1. Chiriboga M., X., Campos-Herrera, R., Jaffuel, G., Röder, G., Turlings, T.C.J. (2017) Diffusion of the maize root signal (E)-β-caryophyllene in soils of different textures and the effects on the migration of the entomopathogenic nematode Heterorhabditis megidis. Rhizosphere.
  1. Jaffuel, G., Blanco-Pérez, R., Büchi, L., Mäder, P., Fließbach, A., Charles, R., ... & Campos-Herrera, R. (2017). Effects of cover crops on the overwintering success of entomopathogenic nematodes and their antagonists. Applied Soil Ecology, 114, 62-73.
  1. Brütsch, T., Jaffuel, G., Vallat, A., Turlings, T. C., & Chapuisat, M. (2017). Wood ants produce a potent antimicrobial agent by applying formic acid on tree‐collected resin. Ecology and evolution, 7(7), 2249-2254.
  1. Imperiali, N., Chiriboga, X., Schlaeppi, K., Fesselet, M., Villacrés, D., Jaffuel, G., ... & Maurhofer, M. (2017). Combined field inoculations of Pseudomonas bacteria, arbuscular mycorrhizal fungi and entomopathogenic nematodes and their effects on wheat performance. Frontiers in Plant Science, 8, 1809.
  1. Jaffuel, G., Chappuis, L., Guillarme, D., Turlings, T. C., & Glauser, G. (2018). Improved separation by at-column dilution in preparative hydrophilic interaction chromatography. Journal of Chromatography A, 1532, 136-143.
  1. Jaffuel, G., Blanco-Pérez, R., Hug, A. S., Chiriboga, X., Meuli, R. G., Mascher, F., ... & Campos-Herrera, R. (2018). The evaluation of entomopathogenic nematode soil food web assemblages across Switzerland reveals major differences among agricultural, grassland and forest ecosystems. Agriculture, Ecosystems & Environment, 262, 48-57.
  1. Jaffuel, G., Půža, V.,Hug, A-S., Giulio Meuli, R., Nermuť, J., Turlings, T.C.J., Desurmont G.A.,  & Campos-Herrera, R. (2018) Molecular detection and quantification of slug parasitic nematodes from the soil and their hosts. Journal of Invertebrate Pathology, 160, 18-25
  1. Jaffuel, G., Imperiali, N., Shelby, K., Campos-Herrera, R., Ryan Geisert, R., Maurhofer, M., Loper J., Keel, C., Turlings, T.C.J., Hibbard B.E. (2018). Protecting maize from rootworm damage with the combined application of arbuscular mycorrhizal fungi, Pseudomonas bacteria and entomopathogenic nematodes. Scientific Reports, 9, 3127.

Geoffrey Jaffuel




+41 32 718 25 13

Bureau D105