Anthracnose stalk rot of corn. Anthracnose lesions; Anthracnose symptoms and k-deficiency; Anthracnose leaf blight on corn; Anthracnose top dieback symptoms; Early symptoms of anthracnose stalk rot in corn; Anthracnose; Anthracnose in hail-damaged corn; Anthracnose infection of hail-damaged corn; Anthracnose leaf blight on corn; Anthracnose symptoms on stalk rind Anthracnose. Anthracnose in corn can be present as leaf blight, top die-back, or stalk rot. Earlier this growing season, anthracnose leaf blight was prevalent in many cornfields in Iowa. Anthracnose leaf blight is usually not observed on corn-on-soybean fields. Anthracnose Leaf Blight and Stalk Rot of Corn . Disease Development Anthracnose is caused by the fungus Colletotirchum graminicola which overwinters on corn residue. Anthracnose of corn is caused by the fungus, Colletotrichum graminicola. Wind and splashing rain spread the fungus to the leaves and stalk. If the environment remains conducive for further development the … Symptoms. Rain splashing can carry spores from blighted leaves and corn debris. Conditions favoring this disease include warm humid weather especially when corn follows corn. Early in the season, lower leaves usually show symptoms first. Anthracnose leaf blight and stalk rot of corn, caused by the fungus Colletotrichum graminicola, is a disease of worldwide importance.Yield losses can approach 40% and up to 80% lodging has been observed in fields with severe levels of anthracnose. Of course, the fungus that causes anthracnose leaf blight in the spring, also causes stalk rot at the end of the growing season. There are three distinct phases of anthracnose: leaf blight, top die-back, and stalk rot. Anthracnose leaf blight of corn. The fungus survives in corn residue, first infecting the lower corn leaves as the spores are splashed from the soil surface. 1. Symptoms begin on lower corn leaves early in the growing season and then develop on the upper leaves late in the season. Later, symptoms can occasionally be found on upper leaves. Fig. The causal pathogen of anthracnose leaf blight also produces a stalk rot and top dieback. The first symptoms of anthracnose leaf blight are water-soaked, oval lesions with tan centers and reddish-brown borders. Anthracnose top dieback and stalk rot Anthracnose is caused by the fungus, Colletotrichum graminicola. Symptoms of anthracnose on the bottom leaves of corn seedlings in a corn-on-corn field in Central Iowa. Symptoms can be seen on leaves and the stalk, both above and below the ear. Closely monitor fields with leaf blight should conditions favor development of the stalk rot phase of anthracnose. Anthracnose also causes a distinctive blackening of the stalk rind. Disease Facts Also caused by the fungus Colletotrichum graminicola, Anthracnose stalk rot of corn can lead to reduced ear development.. 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