Eradication of Chrysanthemum stem necrosis virus from the United Kingdom
The NPPO of the United Kingdom informed the EPPO Secretariat of another incursion of Chrysanthemum stem necrosis virus (Tospovirus, CSNV – EPPO A1 List) on its territory. It can be recalled that in 2002, the virus had been detected in glasshouse chrysanthemums in South West England and successfully eradicated (EPPO RS 2003/057 and RS 2003/123).
In 2010, a new outbreak was detected in the South West of England. It is most likely that the virus arrived on the nursery in chrysanthemum cuttings from Brazil, with the virus then being transmitted from one crop to the next by a local population of Frankliniella occidentalis. Due to the isolated nature of the nursery, spread to other sites was considered to be unlikely. Eradication measures were taken and included the destruction of symptomatic plants and chemical control of the thrips to reduce the vector population. The aim was that there must be 135 days without a finding of CSNV in either plants or thrips before the outbreak could be considered as eradicated. This was considered to be the maximum life span of an individual thrips (plus a safety margin). As of 2009-11-11 and 2009-01-21, CSNV could no longer be detected in plants and thrips, respectively. Therefore, the NPPO of the United Kingdom considered that this outbreak was eradicated.
The pest status of Chrysanthemum stem necrosis virus in the United Kingdom is officially declared as: Absent, pest eradicated.
Sources
NPPO of UK (2010-03 and 2010-07).