Anthracnose occurs both as a foliar blight and a rot of the crown, stem base, and roots. Anthracnose typically occurs in the mid-summer, attacking the leaves and stems of most cool-season turfgrass species. Anthracnose basal rot can occur during the spring, summer, and fall, developing in the crowns, stem bases and roots.
Anthracnose appears in irregular yellow or bronze patches of diseased turf. Symptoms on individual plants first appear as yellow or red lesions on the oldest leaves, and then progress to blight the younger leaves and shoots. These lesions can enlarge and merge to kill the entire leaf blade. The fungi commonly infect grass blades from the tip down, especially infecting grass that has been freshly mowed. During cool, wet periods- or during hot weather on closely cut lawns- water-soaked lesions will rot the stems. The lesions will become bleached, girdling the tiller, scattering individual or small patches of plants to turn yellow and die. This can especially occur during warm to hot weather, especially on dry soil when the turf and atmosphere are wet or very humid.
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