Impact of Climate Change on Plant Disease Dynamics and Pathogen Distribution: A Review

Abstract

Climate change is reshaping plant disease dynamics and pathogen distribution, creating substantial risks for agricultural sustainability and food security. Increasing temperatures, altered precipitation regimes, elevated atmospheric carbon dioxide concentrations, and more frequent extreme weather events are modifying interactions among host plants, pathogens, and their surrounding environment. Higher temperatures accelerate pathogen reproduction, shorten latent periods, and reduce overwintering mortality, enabling multiple infection cycles within a single season. Geographic expansion of pathogens toward higher latitudes and elevations is becoming more evident as thermal barriers decline. Variability in rainfall intensity and humidity directly influences spore germination, infection efficiency, and dispersal processes, thereby altering epidemic timing and severity. Periods of drought and heat stress weaken host defense mechanisms, disrupt physiological balance, and enhance vulnerability to necrotrophic and opportunistic pathogens. Elevated CO₂ modifies plant morphology, canopy density, and carbon-to-nitrogen ratios, which can influence pathogen aggressiveness and disease expression. Insect vectors are responding to warming trends through extended activity periods and range expansion, increasing the transmission potential of viral and bacterial diseases. Soil-borne pathogens are affected by changes in soil temperature, moisture fluctuations, and shifts in microbial community composition, influencing soil suppressiveness and long-term plant health. Technological progress in epidemiological modeling, climate-based forecasting, and remote sensing strengthens predictive capacity for disease outbreaks, though uncertainty persists due to complex, interacting variables. Adaptive strategies such as breeding for climate-resilient cultivars, integrated disease management, biological control approaches, and climate-responsive agronomic practices are critical for reducing future risks. Enhanced monitoring networks and interdisciplinary collaboration remain essential for managing emerging plant health challenges under continuing environmental change.