Soilborne turfgrass diseases are particularly difficult to diagnose and manage because the pathogens subversively infect and damage roots well before plant symptoms arise.  This seminar will describe the soil environment in correlation with the biology and epidemiology of the pathosystem of soilborne diseases infecting cool-season turfgrasses. The course will also explain the crucial aspects of each disease cycle, highlighting where disease control measures can most effectively impede pathogen development.