Turgrasses under intensive management are often subject to outbreaks of infectious diseases. Diseases usually are most damaging when weather or cultural conditions favor the disease-causing agent but not plant growth and vigor. Cultural conditions that predispose turfgrass to diseases include close mowing, inadequate or excessive nitrogen fertility, light or frequent irrigation, excessive thatch, poor drainage, and shade.
Vincelli, Paul C. and Munshaw, Gregg, "Chemical Control of Turfgrass Diseases 2015" (2014). Agriculture and Natural Resources Publications. 179.