Powdery Mildew Information
Scientific Name: Blumeria graminis
Turfgrass host: Kentucky Bluegrass, fine leaf fescues.
Time of Year: April thru October
How To Identify Powdery Mildew
Powdery mildew in Kentucky Bluegrass is common when the nights are damp and cool and the days are cloudy. White, powdery patchs of mildew develop on grass leaves, especially in shaded or poorly drained areas. Heavily infected turf appears dull white, as if dusted with flour. Disease leaves often turn yellow, wither and die. Plant growth is reduced and heavily infested plants may die.
How to get rid of Powdery Mildew
Avoid planting Kentucky Bluegrass in shady wet areas. You can use fine-leaf fescues instead which are more tolerant grasses than Kentucky Bluegrass. Fungicides that will cure powedery mildew is DMI and Qol. A word of warning: Powdery Mildew can become resistant to powdery mildew so you chemicals as a last resort.