Fig. (11) Effect of peptone source in KM-TTC medium on the virulence of Ralstonia solanacearum during seedling challenge inoculation on tomato. Following root-injury and soaking-inoculation of cv. Arka Vikas (after two weeks of sowing), seedling mortality was recorded four weeks later (a). The extent of colony pigmentation in the supernatant of whole colony suspension and of the 0.1 A600 inoculum used for seedling challenge were recorded at A500 (b).