Both the PRA and the PRA report are available. 

The risk of establishment of Hydrocotyle ranunculoides in waterways, and negative impacts on their vegetation and use, justifies measures to prevent its further spread in the EPPO region. The pest qualifies as a quarantine pest. 

According to the Climex simulation, the atlantic and mediterranean areas of the EPPO region that are characterized by mild winter are the most at risk. The countries at risk are: Albania, Algeria, Austria, Azerbaijan, Belgium, Bosnia & Herzegovina, Bulgaria, Croatia, Cyprus, Denmark, France (including Corsica), Greece, Ireland, Israel, Italy (including Sardinia), Jordan, Germany (mostly western part), Hungary, Moldavia, Morocco, Portugal, Romania, Russia (Black Sea), Serbia, Slovenia, Spain, Switzerland, Tunisia, Ukraine, the United Kingdom, Republic of Macedonia, Romania, Turkey. There is some uncertainty, how the plant would perform in Northern and Eastern Europe. However, severe continental winters and hot and dry summers (e.g. in continental conditions) are likely to limit distribution of the species. (See Appendix 3). Additional shortage of water during summer would also limit the success of the species.