Update: Ralstonia solanacearum, (race 1): Findings in ornamental Rosa plants for planting for cut flower production

Publication Date
Mon, 26 Oct 2015, 14:58
Last Updated
Feb. 7, 2017, 2:01 p.m.
Report Number
NLD-41/2
Country
Netherlands
Pest Id
Ralstonia solanacearum race 1 - (PSDMSO)
Report Status
Preliminary
Hosts
Rosa
Pest Status
  • Transient: actionable, under eradication
Summary

This report concerns an update of the official finding of Ralstonia solanacearum in the Netherlands at a glasshouse company producing Rosa cut flowers, variety ‘Armando’, reported in September 2015. The finding was triggered following symptoms observed by the grower. The identity of R. solanacearum was confirmed on 11 September 2015, whereby race 1 of R. solanacearum was identified on 23 September 2015. At a second glasshouse company producing Rosa cut flowers, in lots of the varieties Savita, Talea/Avantique (mixed sample) , R. solanacearum was detected and confirmed on 9 October 2015. In two lots of Red Naomi cut flowers at a third glasshouse company producing Rosa cut flowers, R. solanacearum was detected and confirmed on 13 October 2015. At each of the three Rosa cut flower producers, water samples taken from recirculation water used for irrigation were tested positive for R. solanacearum. Trace-back and trace-forward investigations have revealed suspicions (based on preliminary test results on water samples and/or plant samples) at five other companies, including three propagation companies. Investigations are on-going. At the three cut flower production companies, many plants at various locations in the greenhouses showed symptoms. Measures have been taken aimed at prevention of spread and eradication. The possible source of the outbreak is yet unknown and under investigation. To investigate a possible link with an earlier finding of Ralstonia solanacearum (race 1) on Anthurium (see NL pest report August 2015) and an earlier finding on Curcuma plants for planting in 2014 (see NL pest report August 2014), a comparative DNA analysis is performed on isolates from Rosa, Curcuma and Anthurium. The first results shows no differences among the Rosa isolates but Rosa isolates were different from the isolates from Curcuma and Anthurium. More isolates R. solanacearum will be included in the future.

Report files
Update October 2015 PEST Report: Ralstonia solanacearum, (race 1): Findings in ornamental Rosa plants for planting for cut flower production
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