Clotilde Djuikem

  • Clotilde Djuikem
    • Master, University of Douala, 2017-2018
      Supervisors: S. Bowong, R. Tagne
    • PhD, Université Côte d’Azur, Oct. 2019-Jan 2023
      Supervisors: F. Grognard, S. Touzeau, S. Bowong
 

Context

  • Coffee: important cash crop for many countries in the tropics
  • Coffee leaf rust (basidiomycete fungus Hemileia vastatrix) is the most serious leaf disease (premature defoliation, flower & fruit abortion, shoot desiccation), inducing major crop losses
  • Control methods: fungicides vs quarantine, cropping practices, resistant cultivars, biological control (still under development)
  • Existing model(s): simple dynamic model [Vandermeer et al. 2014] and transmission rate estimations based on field experiments [Vandermeer et al. 2018]; interaction model between rust and a bacterial biological control agent, with stochastic spore dispersion in a discrete space [Arroyo Esquivel et al. 2018]

J. Vandermeer, P. Rohani. The interaction of regional and local in the dynamics of the coffee rust disease, 2014. arXiv:1407.8247

J. Vandermeer J, Z. Hajian-Forooshani, I. Perfecto. The dynamics of the coffee rust disease: an epidemiological approach using network theory. European Journal of Plant Pathology 150: 1001, 2018. DOI: 10.1007/s10658-017-1339-x

J. Arroyo-Esquivel, F. Sanchez, L.A. Barboza. Infection model for analyzing biological control of coffee rust using bacterial anti-fungal compounds. Mathematical Biosciences 307: 13-24, 2019. DOI: 10.1016/j.mbs.2018.10.009

Objectives

  • To develop a model representing coffee leaf rust damages in a coffee plot
  • To design efficient and sustainable control strategies

Work progress

Achieved

  • ODE model describing the fungus propagation on juvenile and mature berry-producing branches: bifurcation analysis

    C. Djuikem, F. Grognard, S. Touzeau. Bifurcation analysis in an epidemiological model of fungal crop disease. Oral presentation in: ECMTB – 12th European Conference on Mathematical and Theoretical Biology, Heidelberg, Germany, 19-23 September 2022. HAL: hal-03896572

    C. Djuikem, F. Grognard, S. Touzeau. Bifurcation analysis in an epidemiological model of fungal crop disease. In revision for Journal of Mathematical Biology, 2023.

  • Spatio-temporal PDE model of coffee rust spread: model analysis (equilibria, stability, basic reproduction number and numerical simulations)

    Clotilde Djuikem. Modelling, Analysis and Simulation of fungus Hemilia vastarix, coffee pest. Master thesis in Mathematics and Applications, University of Douala, April 2018. Supervisors: S. Bowong and R. Tagne.

    C. Djuikem, F. Grognard, S. Touzeau, S. Bowong. Modelling and controlling fungus Hemileia vastatrix, a coffee pest. Oral presentation in: BIOMATH 2019 – International Conference on Mathematical Methods and Models in Biosciences, Bȩdlewo, Poland, 16-22 June 2019. HAL: hal-02309454

    C. Djuikem, F. Grognard, R. Tagne, S. Touzeau, S. Bowong. Modelling coffee leaf rust dynamics to control its spread. Mathematical Modelling of Natural Phenomena 16: 26, 2021. DOI: 10.1051/mmnp/2021018. HAL: hal-03188365

  • Extension to a multi-seasonal framework (hybrid model)
  • Implementation of sustainable control methods, based on alternatives to fungicides (continuous or impulsive control)

    C. Djuikem, F. Grognard, S. Touzeau. Impulsive model and hyperparasite-based biocontrol of coffee leaf rust propagation. Oral presentation in: MPDEE – Conference on Mathematical Population Dynamics, Ecology and Evolution, Marseille, France, 26-30 April 2021. HAL: hal-03456344

    C. Djuikem, A. Yabo, F. Grognard, S. Touzeau. Mathematical modelling and optimal control of the seasonal coffee leaf rust propagation. Oral presentation in: ADHS 2021 – 7th IFAC Conference on Analysis and Design of Hybrid Systems, Brussels, Belgium, 7-9 July 2021. IFAC-PapersOnLine 54(5): 193-198. DOI: 110.1016/j.ifacol.2021.08.497. HAL: hal-03274865

    C. Djuikem, F. Grognard, S. Touzeau. Impulsive model of rust dynamics and predator releases. Oral presentation in: CMPD6 – Computational and Mathematical Population Dynamics , Winnipeg, Canada, 22-27 May 2023. HAL: hal-04140599

    C. Djuikem, F. Grognard, S. Touzeau. Impulsive modelling of rust dynamics and predator releases for biocontrol. Mathematical Biosciences 356: 108968, 2023. DOI: 10.1016/j.mbs.2023.108968. HAL: hal-03952381

  • PhD defence 5 January 2023

    Clotilde Djuikem. Mathematical modelling and control of perennial plant phytopathogens. Université Côte d’Azur, France, 2023. HAL Id: tel-04026720

Misc

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