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Absence of Ralstonia syzygii subsp. indonesiensis from Australia

Publication Date
Thu, 24 Feb 2022, 05:55
Last Updated
Feb. 24, 2022, 5:55 a.m.
Report Number
Report Status
Tomato, potato, capsicum, clove
Pest Status (ISPM 8 - 2021)
  • Absent: pest no longer present
  • Absent: pest records invalid
Geographical Distribution

There is a single record of Ralstonia syzygii subsp. indonesiensis from Australia, that was made in 1979 from tomato in the Northern Territory. Several subsequent surveys for Ralstonia in that area were conducted in the 1990’s, however the bacterium was not found. Since that time the bacterium has not been detected again in Australia. Given that the bacterium causes an aggressive disease of several solanaceous plants widely grown in Australia such as potato and tomato, and has not been recorded since 1979 despite several targeted surveys, it is believed that, if the record was valid, the bacterium has died out naturally from Australia and is no longer present.

The single isolate of Ralstonia syzygii subsp. indonesiensis collected from Australia is named ACH0732, and has been used in scientific research around the world. It has been widely characterised as an aberrant strain with discordant phylogenetic positions based on different gene sequences and corresponding biovar classification. This casts doubt on the original identification of the isolate and suggests that the pest record should also be considered invalid.

Determination that the pest is not present
Report files
Issue keywords
Pest status:Absent/Absence
Commodity keywords

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