Figure 1. Virulence of Ralstonia solanacearum strains GMI1000 and UW551 on resistant and susceptible tomato plants.
Unwounded susceptible (cv. Bonny Best) and horizontally resistant (H7996) tomato plants were soil-soak inoculated to a concentration of ∼1×108 CFU/g soil and incubated at 28°C. Plants were rated daily on a 0 to 4 disease index scale where 0 = healthy and 4 = 100% wilted. Each point represents the mean disease index (± SE) for four independent experiments, each containing 16 plants per treatment.