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Septoria nodorum blotch (SNB), caused by Parastagonospora nodorum, co-occurs with Septoria tritici blotch (STB) (caused by Mycosphaerella graminicola) in the western, moist areas of the Pacific Northwest; the upper Plains states of North Dakota, South Dakota, and Minnesota; and the states adjacent to the Great Lakes. It is the only important wheat leaf blotch in the eastern seaboard states from Florida to Delaware. (Tan spot caused by Pyrenophora tritici-repentis).
