On synergistic co-infection in crop diseases. The case of the Maize Lethal Necrosis Disease

Chapwanya Michael, Matusse A., Dumont Yves. 2021. On synergistic co-infection in crop diseases. The case of the Maize Lethal Necrosis Disease. Applied Mathematical Modelling, 90 : pp. 912-942.

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Abstract : Crops are often subject to intense attacks by pests and diseases. Among them, Maize Lethal Necrosis (MLN) is a serious disease that impact maize crops in many Southern countries. It results from the synergistic interaction of two plant viruses, transmitted by two vectors. In this paper, we develop a general deterministic epidemic model of crop-vector-borne disease for synergistic co-infection, with a particular focus on MLN disease. A theoretical analysis shows that different thresholds exists that drive the dynamics of the system: the well known basic reproduction numbers and also invasion reproduction numbers. The latter are essential for the emergence or not of the MLN disease. After a global sensitivity analysis, we illustrate our results through numerical simulations and discuss potential control methods such as vector control and roguing.

Mots-clés Agrovoc : Zea mays, Nécrose, Maladie des plantes, Infection, Synergisme, Transmission des maladies, Modélisation des cultures, Modèle mathématique, Analyse qualitative, Analyse globale

Mots-clés complémentaires : nécrose létale du maïs

Mots-clés libres : Co-infection, Synergistic effect, Mathematical modelling, Basic reproduction number, Invasion reproduction number, Qualitative analysis, Maize Lethal Necrosis, Global sensitivity analysis, Numerical simulations

Classification Agris : H20 - Plant diseases
U10 - Computer science, mathematics and statistics

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

  • Chapwanya Michael, University of Pretoria (ZAF)
  • Matusse A., University of Pretoria (ZAF)
  • Dumont Yves, CIRAD-BIOS-UMR AMAP (REU) ORCID: 0000-0003-4817-685X

Source : Cirad-Agritrop (

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