Dataset Information

Pest categorisation of Tatter leaf virus.

ABSTRACT: The EFSA Panel on Plant Health performed a pest categorisation of Citrus tatter leaf virus (CTLV) for the EU territory. This virus is the causal agent of tatter leaf and graft incompatibility in trifoliate orange (Poncirus trifoliata) and its hybrids. CTLV is now recognised as a synonym of Apple stem grooving virus (ASGV), the type Capillovirus species, for which efficient diagnostics are available. There are no known ASGV vectors. The virus is reported in citrus from many countries. In the EU, while ASGV is widely present on apple and pear, it has never been reported on citrus. Since the citrus plants for planting pathway is closed by existing legislation, the main pathway for entry is plants for planting of other host species. In the EU, the high prevalence of ASGV in non-citrus hosts, but its absence in citrus ones suggests that interspecific host transfers are rare. However, there are high uncertainties on the importance and specifics of such host change events. No limits to the establishment of ASGV are identified and spread is likely through the vegetative propagation and trade of infected hosts. Infection of sensitive citrus rootstocks leads to stunted growth and decline of the entire plant a few years after grafting. The rootstocks that are now widely used to prevent citrus tristeza decline are the most affected. Among the criteria evaluated by EFSA for an organism to qualify as a Union quarantine pest, ASGV does not meet the criterion of being absent from or under official control in the EU territory. ASGV satisfies all the criteria evaluated by EFSA to qualify as a Union regulated non-quarantine pest. The main uncertainties concern the possible unreported presence of ASGV in citrus in the EU, the existence and efficiency of interspecific host transfers and the existence of ASGV natural spread.

SUBMITTER: EFSA Panel on Plant Health (PLH)

PROVIDER: S-EPMC7009904 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature

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Pest categorisation of Tatter leaf virus.

Jeger Michael M Bragard Claude C Caffier David D Dehnen-Schmutz Katharina K Gilioli Gianni G Gregoire Jean-Claude JC Jaques Miret Josep Anton JA MacLeod Alan A Navajas Navarro Maria M Niere Björn B Parnell Stephen S Potting Roel R Rafoss Trond T Rossi Vittorio V Urek Gregor G Van Bruggen Ariena A Van der Werf Wopke W West Jonathan J Chatzivassiliou Elisavet E Winter Stephan S Catara Antonino A Duran-Vila Nuria N Hollo Gabor G Candresse Thierry T

EFSA journal. European Food Safety Authority 20171031 10

The EFSA Panel on Plant Health performed a pest categorisation of Citrus tatter leaf virus (CTLV) for the EU territory. This virus is the causal agent of tatter leaf and graft incompatibility in trifoliate orange (Poncirus trifoliata) and its hybrids. CTLV is now recognised as a synonym of Apple stem grooving virus (ASGV), the type Capillovirus species, for which efficient diagnostics are available. There are no known ASGV vectors. The virus is reported in citrus from many c ...[more]

PMID: 32625320

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Project description:Following a request from the EU Commission, the EFSA Panel on Plant Health conducted a pest categorisation of carrot thin leaf virus (CTLV) for the EU territory. The identity of CTLV, a member of the genus Potyvirus (family Potyviridae), is well established and reliable detection methods are available. 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 Germany and Slovenia and the NPPO of both countries confirmed these reports. No official national measures have been taken so far. In 2018, CTLV was reported from Greece on Torilis arvensis subsp. arvensis. Since then, no other reports exist. According to the NPPO, the virus did not establish in Greece. In natural conditions, CTLV infects plant species of the family Apiaceae (i.e., carrot, coriander, parsley and several wild weed species). The virus is transmitted in a non-persistent manner by the aphids Myzus persicae and Cavariella aegopodii, which are widely distributed in the EU. CTLV has been reported not to be transmitted by carrot seeds, while no information is available for the other hosts. Since transmission through seeds is not uncommon for potyvirids, it cannot be excluded that CTLV can be seed transmitted for some hosts. Plants for planting, including seeds for sowing, were identified as potential pathways for entry of CTLV into the EU. Cultivated and wild hosts of CTLV are distributed across the EU. Economic impact on the production of cultivated hosts is expected if further entry and spread in the EU occur. Phytosanitary measures are available to prevent further entry and spread of the virus on its cultivated hosts. Currently, CTLV does not fulfil the criterion of being absent or present with restricted distribution and under official control to be regarded as a potential Union quarantine pest, unless official control is implemented. This conclusion is associated with high uncertainty regarding the current virus distribution in the EU.

Dataset Information

Pest categorisation of Tatter leaf virus.

Publications

Pest categorisation of Tatter leaf virus.

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