The virulence of Burkholderia glumae strains in rice. The numbers indicate the disease severities caused by each strain of B. glumae or water. Disease severity was determined with a 0- 9 scale (0 - no symptom, 9 – more than 80% discolored panicles) at 10 days after bacterial inoculation and each number indicates a mean value from at least five replications. The superscript letters of the disease severity values indicate significant differences among B. glumae strains (P < 0.01).