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Causal organism - Septoria tritici (Mycosphaerella graminicola)
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Mainly wheat, but also occasionally on rye and some grass species.
Symptoms of S. tritici can be seen very early in the growing season
in most years. On young autumn-sown wheat, water-soaked
patches which quickly turn brown and necrotic
may be evident by early December and throughout the winter on the lowest leaves.
These contain the visible black pycnidia
which are the most characteristic feature of S. tritici 
Pycnidia are particularly common on dead overwintering leaves of winter wheat.
Lesions on the mature plant are
brown and are sometimes restricted by veins giving rectangular appearance.
The
black pycnidia become visible in the lesions as the symptoms become visible.
Lesions may coalesce leading to large areas of necrotic brown tissue.
