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Powdery mildew on turfgrass.

Symptoms: Powdery mildew infects only the foliage of susceptible plants. It is first seen as isolated colonies of fine, whitish mycelia on leaves and leaf sheaths. The colonies enlarge rapidly and coalesce to cover much of the leaf surface with a largely superficial, white mat of fungal mycelium. The disease results in large areas of the turf appearing as if they were dusted with powder. Older leaves are more susceptible to attack than the young succulent growth. Heavily infected leaves turn yellow, and then tan or brown, as they die. Colonies of powdery mildew darken as they become older, and tiny black fruiting bodies (cleistothecia) may form in the mycelial mat. Although powdery mildew does not kill the plants, infected plants are weakened and are easily killed by other stresses, such as drought, low temperatures, or other diseases.