Leaf spot and melting out

The incidence of Bipolaris leaf spot and Curvularia blight on warm-season turf has been on the rise for the past few years. Many times, they occur together. With a threat temperature of 70F (21C), these diseases cause damage on foliage, and also on crowns and roots, but usually attack turf only if it is stressed. Unfortunately, stress is more common in the summer than anyone would like.

Stress to warm-season turf can be caused by low light, low nitrogen or…