Tall fescue (Festuca arundinacea) is a cool season turfgrass used widely in home lawns, parks, and athletic fields. Brown patch, caused by the fungus Rhizoctonia solani, is one of the most devastating diseases that occurs on tall fescue. Currently, applications of chemical fungicides are the only effective management practice to reduce disease severity. An alternative solution to the use of chemical treatments would be through the development of resistance cultivars by modern breeding techniques. Replicated field trials of experimental clonal selections were conducted at two locations in central New Jersey to evaluate the broad sense heritability of brown patch resistance. Each field trial was planted in April as mowed spaced-plants and consisted of 270 genotypes replicated 6 times in a randomized complete block design. To ensure uniform disease pressure, each field trial was inoculated with two Rhizoctonia solani isolates grown on sterile Kentucky bluegrass seed at a rate of 0.2g/ft². After inoculation, cultural practices that favored the disease were implemented. Visual disease ratings were taken on a weekly basis when symptoms of the disease appeared using a scale of 1-9, with 9 representing the least amount of disease. Preliminary data illustrating the diversity of brown patch resistance among tall fescue will be presented. Significant differences between tall fescue genotypes were observed.