Overall assessment of pest: It is possible for it to enter the UK along the pathways discussed, but unlikely that it would transfer to hosts, find a suitable environment and establish. More information on host and environmental preferences would be required to reduce the level of uncertainty. If it did establish, however, the pest would be difficult to eradicate as it could easily survive in untreated and unmonitored wild host populations. The pest is likely to be detected early in the UK though, due to our lack of other fruit fly pests on cherries with which it may be confused. The area most at risk is the south-east, where conditions are most likely to be favourable and where the largest concentration of hosts (commercial and other) are found. The pest is an appropriate candidate for stage 3 of the PRA.