In general, it is not considered to be a serious disease on turf.
Powdery mildew occurs on a wide variety of turfgrass species wherever turfgrasses are grown.
In Ohio, it is primarily a concern on Kentucky bluegrass although it may also occur to a lesser degree on various fescues. Severe outbreaks on Kentucky bluegrass tend to occur on turf growing in shaded areas during the late spring or mid-fall when moderate temperatures and high relative humidity prevail. Powdery mildew on turf. Powdery mildew on leaf surface. Conidia of Erysiphe graminis .