Csl Pest risk analysis for Florida Passion Flower Virus
The first findings of Florida passion flower virus (synonym Passiflora chlorosis virus) in the UK occurred at 3 nurseries between November 2007 and March 2008 on plants of Passiflora caerulea ‘Constance Elliot’. This virus was first described in 2007 (2004 and 2006 records) from Florida, USA and is not subject to statutory control anywhere in the world. Although the first UK outbreak was symptomatic, with 700 plants showing foliar symptoms, the next two findings were not. The full distribution and host-range of the virus is not known but it may already be present in the UK as the plants were of UK origin and CSL have previously diagnosed unknown potyviruses on Passiflora spp. on UK material. Because it is a potyvirus its principal mode of transmission is by aphids but it could also be mechanically transmitted or (less likely) transmitted by seed or pollen. Although plants of Passiflora spp. are valuable this is not a major UK crop and it seems likely that the industry could manage the virus, in the event of any further findings, themselves. In the longer-term, the Passiflora production industry should be able to produce and maintain virus-free stock material as has happened with similar cases of new viruses in ornamentals. It is recommended that Florida passion flower virus should not be subject to statutory control and that advice be given to the horticultural industry regarding measures that can be taken to prevent or respond to new findings. For propagators, advice should include destruction of infected material, maintenance of virus-free stock plants that are used for propagation, good hygiene practice for preparation of cuttings and grafts, and aphicides to control any potential aphid vectors.
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- United Kingdom