Studies on the seedling disease of barley caused by helminthosporium sativum P.K. & B.

Helminthosporium sativum P.K. & B. causes a disease of barley affecting the seedlings as well as the roots, leaves and heads of mature plants. This disease results in an annual reduction in barley yield and is at least partially responsible for fluctuations in yield from year to year and for the restriction of the present barley growing area. The exact amount of loss, however, is difficult to estimate, and often is attributed to factors other than this disease. Machacek (1943) stated that the common root rot of cereals and grasses was widespread in Manitoba