Melting Out

Drechslera poae

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  • Typically found on bluegrass, melting out causes circular to elongated purplish or brown spots with straw-colored centers on leaf blades, leaf sheaths, and stems; symptoms first appear on shaded plants. The leaf spots may be widespread throughout the lawn, indicating spread by windborne spores. Crowns and roots are frequently affected with a dark brown rot. The crown-infected plants are weakened and may die in hot, windy weather, resulting in a thinning out of the turf in scattered areas. The fungus survives on infected bluegrass plants or grass debris and may be seedborne. Melting out thrives in cool (50 to 75° F), moist conditions. It is most severe on closely mowed turf and on turf with high nitrogen fertilization.


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