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The Impact of Temperature and Humidity on Disease Development and Severity of Burkholderia glumae in Rice (Oryza sativa L.)
Abstract
Bacterial panicle blight (BPB), caused by Burkholderia glumae, is a devastating disease of rice, with its severity exacerbated by warm and humid conditions, posing a significant threat to global food security. This study aimed to quantify the relationships between environmental factors, disease development, and yield loss, and to define specific thresholds for predictive disease management. A controlled glasshouse experiment was conducted using a susceptible rice variety, with disease progression, panicle sterility, and microclimate data monitored following inoculation. Results demonstrated a significantly higher area under the disease progress curve (AUDPC) in inoculated plants (p < 0.001). A strong positive correlation was identified between final disease severity and panicle sterility (y = 0.58x + 16, R² = 0.77), confirming the direct impact of BPB on yield. Furthermore, receiver operating characteristic (ROC) analysis established actionable forecasting thresholds, identifying maximum relative humidity >83.7% (AUC = 0.773) and temperature >29.7°C as robust predictors of economic damage. This study provides a quantitative framework that bridges the gap between disease epidemiology and practical management. The defined thresholds enable the development of a precision forecasting system, empowering farmers to implement timely interventions and advancing the goal of sustainable, climate-resilient rice production.
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DOI: 10.33687/phytopath.014.03.5930
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