Pest categorisation of carrot thin leaf virus

Following a request from the EU Commission, the EFSA Panel on Plant Health conducted a pestcategorisation of carrot thin leaf virus (CTLV) for the EU territory. The identity of CTLV, a member ofthe genusPotyvirus(familyPotyviridae), is well established and reliable detection methods areavailable. The pathogen is not included in the EU Commission Implementing Regulation 2019/2072.CTLV has been reported from the USA and Colombia. In the EU, the virus was reported in Germanyand Slovenia and the NPPO of both countries confirmed these reports. No official national measureshave been taken so far. In 2018, CTLV was reported from Greece onTorilis arvensissubsp.arvensis.Since then, no other reports exist. According to the NPPO, the virus did not establish in Greece. Innatural conditions, CTLV infects plant species of the family Apiaceae (i.e., carrot, coriander, parsley andseveral wild weed species). The virus is transmitted in a non-persistent manner by the aphidsMyzuspersicaeandCavariella aegopodii, which are widely distributed in the EU. CTLV has been reported notto be transmitted by carrot seeds, while no information is available for the other hosts. Sincetransmission through seeds is not uncommon for potyvirids, it cannot be excluded that CTLV can beseed transmitted for some hosts. Plants for planting, including seeds for sowing, were identified aspotential pathways for entry of CTLV into the EU. Cultivated and wild hosts of CTLV are distributedacross the EU. Economic impact on the production of cultivated hosts is expected if further entry andspread in the EU occur. Phytosanitary measures are available to prevent further entry and spread ofthe virus on its cultivated hosts. Currently, CTLV does not fulfil the criterion of being absent or presentwith restricted distribution and under official control to be regarded as a potential Union quarantinepest, unless official control is implemented. This conclusion is associated with high uncertaintyregarding the current virus distribution in the EU