Role of irrigation scheduling in disease prevention?

• A. To maximize leaf wetness and disease risk
• B. To save water regardless of disease risk
• C. To promote rapid irrigation at night
• D. To minimize leaf wetness duration, avoid overnight irrigation, and maintain optimal soil moisture to reduce disease risk

Answer: (D)

Keeping leaf surfaces dry as long as possible and preventing extended moisture in the canopy are the main ways irrigation scheduling helps prevent turf diseases. Many turf pathogens require free water on leaves to infect, so scheduling irrigation to minimize how long leaves stay wet reduces infection opportunities. Avoiding overnight irrigation is crucial because wet leaves through the night create ideal conditions for pathogens to work. At the same time, maintaining soil moisture at an optimal level supports healthy, less-stressed plants, which are less susceptible to disease, while preventing overly wet soils that favor root and soil-borne pathogens. In short, the best practice is to minimize leaf wetness duration, avoid late-day or overnight watering, and keep soil moisture in a balanced range to reduce disease risk.