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Control Recommendations Wheat Cultivars
Management Practices Pesticides
Septoria leaf and glume blotch is recognized on leaves by its characteristic
lens-shaped lesions. Leaf lesions develop initially as small water-soaked areas that
become chlorotic (yellowed) and with reddish-brown centers. As the lesion matures to a
size of 1/16 by 1/4 or 1/2 inches, it becomes grayish-brown with chlorotic edges. The
centers of the lesions are ashen-colored with minute, dark, globose pycnidia (spore
producing structures). The spores within the pycnidia are produced within a gelatinous
matrix that oozes out like "toothpaste" during periods of high relative
humidity. The spores can only be moved by splashing rain drops.
The spores also infect and colonize stems and the wheat head. When the head is
colonized the florets become streaked with a purple-brown color and "dotted' with the
minute pycnidia. Within colonized florets the grain fill is impaired and results in low
teat weight and shriveled seeds.
The septoria leaf and glume blotch pathogen survives within infested straw, seed and on volunteer wheat and serves as the source of inoculum to start off the disease cycle in the new crop of wheat. The disease is favored by splashing rain, high humidity, and temperatures between 68 degree to 82 degree F. The disease characteristically moves upward from infection initiated on the low leaves within the crop canopy.
| Disease Management Practices | Foliar Diseases | Seed and Seedling Diseases | Root and Crown Diseases | Head Diseases | Virus Diseases |
