Most commercial cultivars of rice (Oryza sativa L.) are susceptible to sheath blight (SB), a
devastating fungal disease causing significant losses in grain yield and quality. There are
limited sources of genetic resistance adapted to US growing conditions, and no commercial
long grain cultivar of rice is currently available in the United States with a high level of SB
resistance. Sheath blight resistance has been reported to be horizontal and quantitative. A
population of 279 F2: 3 progeny rows derived from a cross between two tropical japonica US …