Ascochyta leaf blight has become a common problem on Kentucky bluegrass lawns in Colorado. Large uniform areas of affected turf will turn straw-colored.
Leaves usually start dying back from the tips.
Ascochyta can occur throughout the growing season, but is more prevalent in the spring when there are extended wet periods. The first line of defense against Ascochyta leaf blight is to manage the turf properly. Ascochyta leaf blight has become a common problem on Kentucky bluegrass lawns in Colorado. This fungal disease is caused by more than 20 species of the genus Ascochyta that attack Kentucky bluegrass, Italian and perennial ryegrass, tall fescue and bentgrass. Ascochyta damage to grass blade.