Findings of tobacco ringspot virus in ornamentals in the Netherlands from 1997 to 2020
A recent article reviews findings of tobacco ringspot virus (Nepovirus nicotianae, TRSV - EPPO A2 List) in ornamentals made in the Netherlands from 1997 to 2020. A large-scale survey was also conducted from 2005 to 2020. In total, TRSV was identified in 13 ornamental species, comprising over 30 cultivars. No symptoms were observed in infected plants, except for several Hemerocallis plants which, after sequencing in 2022, appeared to be co-infected by a novel putative Luteovirus. The nematode vector Xiphinema americanum sensu lato was not detected in the 487 soil samples tested.
In addition to the host plants already listed in EPPO Global Database, the following plants species/genera are reported as host: Allium (ornamental), Anemone, Astilbe, Gladiolus, Gypsophila, Hosta, Iris chrysographes, Iris x louisiana, Iris pallida, Iris pseudacorus, Iris spuria, Iris versicolor, Iris virginica, Pentas.*
As TRSV was detected in consignments of ornamental plants from other EU countries, the authors suggested that TRSV may be more widespread than previously assumed and that TRSV should be regulated as a Regulated Non-Quarantine Pest for blueberry, grapevine and soybean, instead of being listed as a quarantine pest. It may be noted that the status of TRSV in the EU has recently been changed to become a RNQP for blueberry and soybean (EPPO RS 2024/166).
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* Note of the EPPO Secretariat (2024-11): this list was incorrect (as noted in EPPO RS 2024/234). New hosts are as follows: Coleus sp., Pelargonium zonale, Salvia rosmarinus. The host list was corrected in https://gd.eppo.int/taxon/TRSV00/hosts.
Sources
Schoen R, de Krom CE, Westenberg M, Botermans M, van Bruggen AS, Meekes ET, Didden L, Hooftman M, Roenhorst JW (2024) Findings of tobacco ringspot virus in ornamentals in the Netherlands from 1997 to 2020 indicate a need for evaluation of its European Union quarantine status. European Journal of Plant Pathology (early view). https://doi.org/10.1007/s10658-024-02957-3