Ascochyta leaf spot symptoms may develop throughout the growing season but are more common during hot, droughty periods that were preceded by cool, rainy conditions. Large irregular patches of turf rapidly turn a straw-color and appear dead. The overall appearance of the disease may resemble drought stress, except that the symptoms of Asochyta blight appear quickly (i.e. sometimes overnight).
Please see the fact sheet "Ascochyta Leaf Blight of Turf."
and Identification and Management of Turfgrass Diseases
Ascochyta leaf blight.
