Technical Abstract: Pyrenophora teres, causal agent of net blotch of barley exists in two forms designated P. teres f. teres and P. teres f. maculata which induce net form net blotch (NFNB) and spot form net blotch (SFNB), respectively. Genetic studies demonstrate that net blotch resistance in barley is present in both dominant and recessive forms. Early work on virulence of the pathogen showed toxin production to be important in disease induction. Since then, several labs have investigated effectors of virulence and avirulence showing this system to be complex in its host resistance and pathogen virulence mechanisms. Here we assemble recent information from the literature that describes this important pathogen and include reports describing its interaction with barley. We also include preliminary findings from a genome sequence survey.