Pythium blight is historically one of the most devastating diseases of turf. It occurs during hot, humid conditions of summer and can attack both cool and warm season turfgrasses. For us creeping bentgrass, annual bluegrass and perennial ryegrass are the most susceptible. Symptoms often appear in low-lying areas or along drain lines. The disease often produces a white mycelium during the early mornings and the initial symptoms appear grayish color.
The current weather we are experiencing at the moment – temperatures in the 90s (F) with temperatures remaining above 70 F at night combined with high humidity are extremely favorable for this disease.
During extended periods favorable for Pythium blight like we are having now, chemical control is necessary on high maintenance turf. The best means of control is via preventative.