Symptoms. Anthracnose top dieback and stalk rot Anthracnose is caused by the fungus, Colletotrichum graminicola. Anthracnose is a fungal pathogen that affects standability, plant health, and overall yield in corn fields. Anthracnose also causes a distinctive blackening of the stalk rind. 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. Earlier this growing season, anthracnose leaf blight was prevalent in many cornfields in Iowa. Symptoms can be seen on leaves and the stalk, both above and below the ear. Symptoms begin on lower corn leaves early in the growing season and then develop on the upper leaves late in the season. 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 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. Disease Development Anthracnose is caused by the fungus Colletotirchum graminicola which overwinters on corn residue. Anthracnose leaf blight of corn. Anthracnose. Symptoms of anthracnose on the bottom leaves of corn seedlings in a corn-on-corn field in Central Iowa. Wind and splashing rain spread the fungus to the leaves and stalk. Anthracnose is likely the most prevalent stalk rot in the eastern United States. Conditions favoring this disease include warm humid weather especially when corn follows corn. Early in the season, lower leaves usually show symptoms first. Disease Facts Also caused by the fungus Colletotrichum graminicola, Anthracnose stalk rot of corn can lead to reduced ear development.. 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 leaf blight is caused by the fungal pathogen Colletotrichum graminicola and seldom causes yield loss. The fungus survives in corn residue, first infecting the lower corn leaves as the spores are splashed from the soil surface. Anthracnose in corn is very common and is usually one of the first diseases to show up in corn, often showing up on corn seedlings. Anthracnose Leaf Blight and Stalk Rot of Corn . 1. Anthracnose stalk rot of corn. The anthracnose pathogen can infect the plant through the roots and stalks. Anthracnose leaf blight is usually not observed on corn-on-soybean fields. Fig. Rain splashing can carry spores from blighted leaves and corn debris. Anthracnose in corn can be present as leaf blight, top die-back, or stalk rot. Anthracnose of corn is caused by the fungus, Colletotrichum graminicola. Closely monitor fields with leaf blight should conditions favor development of the stalk rot phase of anthracnose. Leaf spots are round to irregular, water-soaked lesions with dark tan … Later, symptoms can occasionally be found on upper leaves. Affected plants have shredded pith and die prematurely. If the environment remains conducive for further development the … Infection of the corn plant by the fungus results in anthracnose leaf blight, top dieback and/or stalk rot.
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