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Date: November 2023
Source: European Plant Protection Organisation (EPPO) Reporting Service 11/2023/256 [summ. Mod.DHA, edited]
https://gd.eppo.int/reporting/article-7738


In the 1990s, a previously uncharacterized disease was observed in cultivated potatoes (_Solanum tuberosum_) in southern Peru. It was named potato rugose stunting disease (PRSD) and was reported to cause severe symptoms, including stunting of plants, as well as mosaic and deformation of leaves. Studies showed that the disease was caused by an unknown isometric virus. This virus had also been intercepted on potato in the Netherlands and in the USA; it was categorised as a potential quarantine pest for the European Union.

Recent research has now shown that the virus is a new species, tentatively named potato rugose stunting virus (PotRSV), belonging to the genus _Torradovirus_. Surveys in Peru detected PotRSV in several regions with an incidence of 2.3 to 5.5%. PotRSV was often found in mixed infections but when found alone, leaf symptoms ranged from mild mosaic to stunting and rugosity. Although it was suggested in the past that this virus could be transmitted by the psyllid _Russelliana solanicola_, vector transmission experiments with _Myzus persicae_ [aphid species - Mod.DHA] and _R. solanicola_ were unsuccessful. Host range studies using artificial inoculations showed that tomato (_Solanum lycopersicum_) and capsicum (_Capsicum annuum_) could be asymptomatic hosts.

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Communicated by:
ProMED

[The genus _Torradovirus_ (family Secoviridae) has been identified less than 20 years ago on solanaceous hosts. The type member _Tomato torrado virus_ (ToTV; see ProMED post 20070324.1030) causes leaf necrosis and necrotic spots on fruit of tomato, with a potential to cause considerable yield losses. ToTV was shown to be transmitted by whiteflies. Additional torradoviruses affecting Solanaceae have since been found. Several torradoviruses affecting non-solanaceous hosts (such as lettuce, carrot) have also been identified which seem to be predominantly spread by aphids.

Pictures
PotRSV symptoms on potato (from the source publication):
https://apsjournals.apsnet.org/cms/10.1094/PHYTO-11-22-0449-V/asset/images/medium/phyto-11-22-0449-vf6.gif
ToTV particles, electron micrograph:
http://www.seedquest.com/News/releases/2007/graphics/18419a.jpg

Links
Source publication:
https://doi.org/10.1094/PHYTO-11-22-0449-V
Information on torradoviruses:
https://doi.org/10.1146/annurev-phyto-080614-120021 (review),
https://doi.org/10.1007/s00705-006-0917-6,
https://doi.org/10.1007/s00705-007-1076-0,
https://gd.eppo.int/taxon/TOTV00,
https://gd.eppo.int/taxon/TOANV0/datasheet,
https://pra.eppo.int/pra/46eed8f0-61f7-4378-826f-47dee446ab6d and via
https://doi.org/10.2903/j.efsa.2020.5853
Virus taxonomy via:
https://ictv.global/taxonomy
Information and taxonomy for plant virus vectors via:
https://bugguide.net/node/view/52
- Mod.DHA]

See Also

2021
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Lettuce necrotic leaf curl virus - France: 1st rep 20210318.8255803
2009
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Tomato torrado virus - Panama, Australia: 1st reps 20090306.0930
2008
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Tomato torrado virus - Hungary: (CS), 1st rep 20080717.2169
2007
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Tomato marchitez virus - Mexico: new virus, (Sinaloa) 20071202.3888
Tomato torrado virus - Poland: (Greater Poland), 1st report 20071113.3684
Torrado disease, tomato - Spain: new findings 20070906.2944
Torrado disease, tomato: new virus identified 20070324.1030

Website: http://www.isid.org

Published: December 14, 2023