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The poor definition of pathotype variation in the rice blast fungus has historically handicapped strategies for reducing blast disease damage to the world's rice crop. We have employed a probe for a dispersed repeated DNA sequence called MGR [Hamer et al. (1989). Proc. Natl. Acad. Sci. USA 86, 9981-9985] to construct genotype-specific, EcoRl restriction fragment length profiles (MGR-DNA fingerprints) from United States field isolates of this fungus. By using a blind-test design, we demonstrated that MGR-DNA fingerprints distinguished the major pathotypes in the United States, accurately identified the pathotypes of isolates collected over a 30-year period, and defined the organization of clonal lineages within and among pathotype groups. These results resolved a lingering controversy regarding rice blast pathotype stability and illustrated new opportunities for tracking the population dynamics and evolution of this important crop pathogen.

DNA Fingerprinting with a Dispersed Repeated Sequence Resolves Pathotype Diversity in the Rice Blast Fungus.