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GrainGenes Pathology Report: Septoria Glume Blotch

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Septoria Glume Blotch
Other Name
Septoria nodorum Blotch
Glume Blotch
Leaf and Glume Blotch
Host Species
Triticum aestivum
Hordeum vulgare
Secale cereale
Causal Organism
Leptosphaeria nodorum
Stagonospora nodorum
Wheat reaction to Septoria glume blotch
Septoria glume blotch, ISWYN24
Gene Class
Reaction to Phaeosphaeria nodorum
Septoria glume blotch is one of the most common and destructive head diseases of wheat in Missouri. Septoria nodorum attacks leaf, sheath and stem tissue with symptoms similar to those caused by Septoria tritici (Septoria leaf blotch). 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 prolonged wet periods and temperatures of 59 to 68 F. Lesions initially appear as light green water-soaked areas that expand into yellowish brown blotches more oval-shaped than those of Septoria leaf blotch. Dark fruiting bodies (pycnidia) eventually appear as brown/black flecks scattered within the lesions. Spores from pycnidia are spread by splashing rain to healthy tissue, permitting the fungus to move up the plant canopy toward the heads. Infected heads develop dark blotches on glumes. Pycnidia forming within these lesions distinguishes Septoria Glume Blotch from other head blights (Black Chaff and Scab). Seed from infected heads are small, shiveled and often infected. Favored by heavy nitrogen fertilization and dense foliage.
Typical leaf symptoms of glume blotch...
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ReferenceKephart KD (1993) Winter wheat disease management Insect and plant disease management handbook.
Reference(1987) Compendium of wheat diseases.