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United States Department of Agriculture

Agricultural Research Service

Pearl Millet Diseases
Fungal Diseases

Exserohilum Leaf Blight

Exserohilum rostratum (Drechs.) K.J. Leonard & E.G. Suggs

Symptoms: Foliar lesions (1-2 × 2-5 mm) are straw colored with brown margins. Lesions are often dark brown at first and then become light brown. Blighting often occurs on leaf tips and margins.

Pathogen and disease characteristics: Pigmented conidia are quite variable but approximately 200 × 8 µm, straight or slightly curved, and rostrate shaped. There are 6 to 16 septa. Terminal septa are particularly dark and thickened. A distinct hilum forms on the basal cell.

Host range: Pearl millet, maize, sorghum, Setaria italica (L.) Beauv., Eleusine coracana Garten.

Geographic distribution: India, United States.

Nomenclature discrepancies:Synonyms:Drechslera rostrata, Exserohilum rostrata (Drechs.) Shoem., Helminthosporium rostratum Drechs.

Seed transmission: Can be isolated from seed (table 4). Seedling infection from contaminated seed has not been demonstrated.

Primary citations:Young et al. 1947,Mohan et al. 1988.

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United States Department of Agriculture
Agricultural Research Service

The material on this page is in the public domain.

Original posting: June 5, 1999.

Last Modified: 8/13/2016
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