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.
United States
Department of Agriculture
Agricultural
Research Service
The material on this page is in the public
domain.
Original posting: June 5, 1999.
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