Abstract
Context
Landscape structure influences the spread of plant pathogens, including coffee leaf rust, a fungal disease affecting the coffee industry. Rust transmission is likely affected by landscape structure through the dispersal of wind-borne spores. Previous studies found positive associations between rust incidence and the proportion of pasture cover, suggesting deforestation may facilitate spore dispersal.
Objectives
We explored the links between landscape structure and coffee rust by modeling the spread of rust transmission. We investigated how (1) spatial clustering of coffee farms, (2) proportion of landscape deforestation, and (3) clustering of deforestation affects the speed of rust transmission.
Methods
We developed a probabilistic model to simulate within-patch and between-patch transmission in simulated and real landscapes. We modeled within-patch transmission using a probabilistic cellular automata model and between-patch transmission using a random walk with spore movement inhibited by canopy cover.
Results
Clustering of coffee farms is the primary driver of rust transmission. Deforestation is a secondary driver of rust spread: outbreaks spread more rapidly in landscapes where deforested areas are evenly dispersed throughout the landscape. When applied to real landscapes in Costa Rica, the model yields the same trends as simulated landscapes and suggests increased amounts of coffee near the starting location of the outbreak are correlated with more rapid rust spread.
Conclusions
It is essential to consider landscape structure when managing the spread of crop diseases. Increasing the spacing between coffee farms and reducing forest fragmentation in coffee-growing regions can benefit biodiversity conservation and reduce the economic impacts of coffee rust.
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Data availability
Not applicable.
Code availability
All code and model outputs are archived on Zenodo at https://zenodo.org/record/6760264#.Yrm2o3bMJdg.
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Acknowledgements
We thank Nick Gotelli and members of the QuEST community at the University of Vermont for helpful feedback on our simulation and analysis. We thank two anonymous reviewers for constructive feedback on this manuscript. We are especially grateful to Jorge A. Ruiz-Arocho for illustrating our graphical abstract. We also thank Emily Fung and Christian Brenes P. at The Tropical Agricultural Research and Higher Education Center (CATIE) for sharing the land-use data used for the real landscape analyses.
Funding
The Quantitative and Evolutionary STEM Training (QuEST) Program financed by the University of Vermont and the National Science Foundation (Grant DGE-1735316) supported all authors. E.M. Bueno was supported by an HHMI Gilliam Fellowship for Advanced Study (Grant #GT13607).
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EMB, NA, and EMB contributed equally to study conception, design, and wrote the first draft of the manuscript. EMB wrote all code for simulations and data analyses. NA obtained real landscape data. All authors read, revised, and approved subsequent drafts of the manuscript.
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Beasley, E.M., Aristizábal, N., Bueno, E.M. et al. Spatially explicit models predict coffee rust spread in fragmented landscapes. Landsc Ecol 37, 2165–2178 (2022). https://doi.org/10.1007/s10980-022-01473-1
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DOI: https://doi.org/10.1007/s10980-022-01473-1