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Host Diversification May Split Epidemic Spread into Two Successive Fronts Advancing at Different Speeds.
F M Hamelin1, Y Mammeri2, Y Aigu3
1Institut Agro, University of Rennes, INRAE, IGEPP, 35000, Rennes, France. fhamelin@agrocampus-ouest.fr.
Bulletin of Mathematical Biology
|May 22, 2022
Summary
Host diversification using plant mixtures can alter disease spread dynamics. While accelerating spread, it simultaneously slows the advance of resistance-breaking pathogens, offering a dual benefit for agroecological disease control.
Area of Science:
- Agroecology
- Plant Pathology
- Population Dynamics
Background:
- Host diversification, including within-field mixtures or mosaics, is a key agroecological strategy for managing plant diseases.
- Understanding disease dynamics in mixed-host systems is crucial for optimizing disease control.
Purpose of the Study:
- To investigate the spatial spread of plant diseases in host mixtures composed of susceptible and resistant genotypes.
- To analyze the impact of pathogen populations with both wild-type and resistance-breaking genotypes on disease dynamics.
Main Methods:
- Modeling spatial disease spread in a system with two host genotypes (susceptible and resistant).
- Simulating pathogen populations with two genotypes (wild-type and resistance-breaking).
- Analyzing the formation and progression of disease invasion fronts.
Main Results:
- Intermediate fractions of resistant hosts can lead to two successive disease fronts.
- The initial front, led by wild-type pathogens, spreads faster but with lower prevalence than in resistant monocultures.
- The second front, led by resistance-breaking pathogens, spreads slower than in resistant monocultures, with stable coexistence and prevalence behind invasion fronts.
Conclusions:
- Host diversification exhibits a dual effect: accelerating overall disease spread while decelerating the spread of resistance-breaking pathogen genotypes.
- These findings enhance the understanding of the complex mechanisms governing the efficacy of host diversification in agroecological systems.
- This research provides valuable insights for developing sustainable plant disease management strategies.
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