The barley genotypes included in the study were offered in 2006 to the barley CAP. The population comprised 94 lines of six-rowed spring barley lines from the University of Minnesota (UM), 64 lines of two-rowed spring barley from Busch Agricultural Resources LLC (BA2), 31 lines of six-rowed spring barley from Busch Agricultural Resources LLC (BA6), 91 lines of six-rowed barley from North Dakota State University (ND6), and 96 lines of two-rowed spring barley from North Dakota State University (ND2). All barley lines were inbred lines of at least F4 generation and selected for uniform agronomic traits.The SFNB severity was assessed 10 to 12 days after inoculation using a slight modification of the rating scale (1 to 9) developed by Tekauz (1985). Symptoms of small necrotic spots with small surrounding chlorotic areas were rated as a resistant reaction (scale 1 to 3), whereas large distinct necrotic spots surrounded by chlorosis which expanded with time were rated as a susceptible reaction (scale 7 to 9). A necrotic spot surrounded by small to moderate chlorotic halos was rated as scale 5.