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GrainGenes Pathology Report: Septoria Leaf Blotch

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Septoria Leaf Blotch
Other Name
Septoria tritici Blotch
Septoria avenae Blotch
Speckled Leaf Blotch
Septoria Leaf Blight
Host Species
Triticum aestivum
Hordeum vulgare
Secale cereale
Causal Organism
Mycosphaerella graminicola
Leptosphaeria avenaria f. sp. triticea
Septoria passerinii
Wheat reaction to Septoria leaf blotch
Septoria leaf blotch, ISWYN24
Septoria leaf blotch, WGRC
Gene Class
Reaction to Mycosphaerella graminicola (Fuckel) Schroeter
Resistance Gene
Stb5 (Triticum)
Stb7 (Triticum)
Stb8 (Triticum)
Stb12 (Triticum)
Septoria leaf blotch fungus survives on wheat residue on or near the soil surface. Initial symptoms appear as chlorotic flecks on seedling leaves in contact with the soil. Foliar infection results from sporulation that occurs in the fall or spring during prolong wet periods and temperatures of 59 to 68 F. Lesions initially appear as light green water-soaked areas. Lesions expand into yellow to reddish brown patches with parallel margins restricted by leaf veins. Lesions will continue to expand under favorable moisture and temperature conditions, and can destroy entire leaf area. Septoria leaf blotch also attacks leaf sheaths, stem tissue and occasionally head tissue. Dark fruiting bodies (pycnidia) appear as brown-black flecks scattered within the lesions. Spores from pycnidia are spread by splashing rain. Favored by heavy nitrogen fertilization and dense foliage.
Conidia of S. passerini (10x40).
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ReferenceKephart KD (1993) Winter wheat disease management Insect and plant disease management handbook.
Reference(1987) Compendium of wheat diseases.