Fig. 1.

Isolation and pathogenicity tests of Ralstonia solanacearum strain SY1. A and B Ralstonia solanacearum strain SY1 was isolated from the stem of one Pogostemon cabli (Blanco) Benth. plant, which exhibited bacterial wilt symptoms, on the Deqing traditional Chinese medicine production base (111°83′ N, 23°25′ E), Deqing City, Guangdong Province of China. Morphology of R. solanacearum strain SY1 colonies. A single colony of the strain SY1 was streaked and cultivated on CPG medium at 30 °C for 24 h. D Symptoms on P. cablin plants (the cultivars from left to right, Hainan; Gaoyao; Shipai; Yingni) generated by R. solanacearum strain SY1 15 days post-inoculation. Roots of P. cablin plants were irrigated with bacterial suspensions (10⁷ CFU/mL) and photographed 15 days later. CFU, colony‐forming units