The septoria leaf and glume blotch disease complex is a common disease of rye, barley, and triticale. Glume blotch of rye, barley, and triticale is caused by S. nodorum. Septoria diseases are favored by warm, wet weather. Spores produced during wet weather are spread by splashing rain, and they initiate infections throughout the year. The symptoms of septoria leaf blotch are lesions on leaves and leaf sheaths that are grayish green and turn light tan with age.
Lesions vary in size.
Eventually, the lesions merge and may cover the whole area of the leaf. The leaf margins often pinch and roll and become dry. The symptoms of glume blotch start out as brown or grayish spots on the leaf blade and leaf sheath. Spots may develop on the glumes and awns after heading. If seed is infected, pycnidia may develop on the seed surface.