Soil as a Battlefield and a Reservoir: Linking Soil Components to the Epidemiology of Soilborne Plant Diseases

Abstract This paper focuses on how microbial diversity, soil organic matter, and soil structure influence the activities of soilborne pathogens and plant disease epidemiology. Microbial diversity, soil organic matter, and soil structure are soil components that can reshape plant–pathogen–soil interactions by altering nutrient dynamics and the composition of the soil microbiome. When beneficial microorganisms are enriched in soil ecosystems, suppression of soilborne pathogens may be enhanced, thereby decreasing disease incidence and severity. However, microbial diversity, soil organic matter, and soil structure may also promote pathogen growth or facilitate cooperative microbial interactions that improve pathogen persistence, thereby elevating disease risk. Future progress requires a shift from descriptive surveys toward functional and predictive approaches, as these soil components influence epidemiological processes that can either suppress or intensify the development of plant diseases caused by soilborne plant pathogens. Rather than acting as deterministic drivers of disease outcomes, microbial diversity, soil organic matter, and soil structure modify the ecological context in which host–pathogen interactions occur, altering the likelihood of pathogen establishment, persistence, and transmission. This paper highlights the importance of soil management in regulating microbial community dynamics and supporting plant disease control within this probabilistic ecological framework.