R. solanacearum comprises sub-populations variously reported as groups, races, biovars, biotypes, sub-races and strains. The commonly applied terms biovar and biotype refer to differences in biochemical and phage reactions (Hayward, 1962). Races, distinguished on the basis of differences in plant host range (Buddenhagen et al., 1962), are usually referred to in this datasheet. The list gives the distribution of the pathogen that causes Moko and Bugtok diseases of triploid bananas and also infects Heliconia spp. Records are of confirmed race 2 or presumed race 2 based on host range.
A record of R. solanacearum race 2 in Cuba (CABI/EPPO, 1999; EPPO, 2013) published in previous versions of the Compendium is considered unreliable as it is based on an old record which cannot be traced. R. solanacearum race 2 has never been found in banana plantations in Cuba (Luis Pérez Vicente, Instituto de Investigaciones de Sanidad Vegetal, Cuba, personal communication, 2014).
The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.
Lists of host records have been recorded (Kelman, 1953; Bradbury, 1986; Persley, 1986; Hayward, 1994) but the original reports, gathered over many years, vary greatly in reliability. Few reference strains of race 2 from reported host plants have been deposited in publicly accessible culture collections to support the authenticity of records. There are many solanaceous and non-solanaceous plant species that are hosts to R. solanacearum. They can only be ascribed to known and possibly novel races when strains from them are isolated and examined.
Persley GJ, 1986. Ecology of Pseudomonas solanacearum, the causal agent of bacterial wilt. In: Persley GJ, ed. Proceedings of an International Workshop held at PCARRD, Los Banos, Philippines 8-10 October 1985. ACIAR Proceedings, 13, 71-76.