Exserohilum turcicum

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Exserohilum turcicum symptoms on a maize ear (click on image to enlarge it)
Source: Florida Department of Agriculture and Consumer Services - IPM Images

Exserohilum turcicum (Pass. 1876) K.J. Leonard & Suggs 1974

The fungus is widely distributed around the world in temperate maize-growing regions and causes northern corn leaf blight. It also infects sorghum and related species. Yield losses of around 20% are common in maize under conditions of high humidity and moderate temperatures. With severe infestations, they can reach 70%.

About 1 week of the infection by the fungus, elongated tan streaks appear on the leaves. These lesions enlarge, reach a length of 5-10 cm, often join and typically become dark brown and cigar-shaped. Dark spores develop on the surface under humid conditions. The Fungus can persist in the field and overwinters on plant debris. Management options include tillage to remove plant residues, crop rotation, partly resistant cultivars and fungicides.

Vernacular names
• Deutsch: Blattfleckenkrankheit an Mais
• English: turcicum leaf blight
northern leaf blight of maize
northern corn leaf blight
• Español: niebla del maiz
añublo de la hoja del maiz
• Français: helminthosporiose du maïs
brûlure des feuilles du mais

Drechslera turcica
Helminthosporium turcicum
Setomelanomma turcica
Setosphaeria turcica