Fig. (12) Effect due to peptone from 12 different sources on colony growth of Ralstonia solanacearum ‘NH-Av01’ in KM-TTC medium (a) and the response of the culture during biovar assay (b). Peptone treatments from different brands as indicated in Table 2. The biovar assay was as per Huang et al. [15]. Treatments in the order control, glucose, trehalose, mannitol, sorbitol, dulcitol, maltose and cellobiose.