News section
home news forum careers events suppliers solutions markets resources directories advertise contacts search site plan
 
.
First report of Tomato torrado virus in Hungary

.

A ProMED-mail post
ProMED-mail is a program of the International Society for Infectious Diseases

A ProMED-mail post
<http://www.promedmail.org>
ProMED-mail is a program of the
International Society for Infectious Diseases <http://www.isid.org>

Date: June 2008
Source: European Plant Protection Organisation (EPPO) Reporting Service
6/2008/129 [edited]
<http://archives.eppo.org/EPPOReporting/2008/Rse-0806.pdf>

Incursion of Tomato torrado virus in Hungary
--------------------------------------------
In early October 2007, a tomato plant (_Lycopersicon esculentum_) showing unusual symptoms was observed in a commercial glasshouse in the county of Csongrad, south eastern Hungary. Symptoms were initially characterized by yellow blotches at the base of the leaflets, which later developed into necrotic spots, giving a burnt-like appearance to the plant. These symptoms resembled those that have recently been described in association with Tomato torrado virus (ToTV), a newly described virus detected in Spain and Poland.

Laboratory analysis (DAS-ELISA [double antibody sandwich-enzyme-linked immunosorbent assay], RT-PCR [reverse transcriptase polymerase chain reaction], dot-blot hybridization) of one leaf sample confirmed the presence of ToTV. Other tomato viruses such as _Potato virus Y_, _Tomato mosaic virus_, _Tomato spotted wilt virus_, and _Pepino mosaic virus_ were not detected. The identification of ToTV was confirmed by another laboratory in Spain (Instituto Agroforestal Mediterraneo, Universidad Politecnica de Valencia).

The source of this infection was unknown. Tomato seeds originated from the Netherlands but the possible role of seeds in disease transmission has not been clarified. It is suspected that the disease is mainly transmitted by
_Trialeurodes vaporariorum_.

In Hungary, no official measures were taken as the ToTV infection was detected at the end of the growing season and all tomato plants were destroyed as part of routine practice. Since this outbreak, no new infection has been observed at this place of production, and biological control has been applied to maintain whitefly population density at a low level. A national survey will be conducted to determine the current status of ToTV in Hungary.

--
communicated by:
ProMED-mail
<promed@promedmail.org>

[ToTV is a new virus, which appears to be spreading. Symptoms of leaf necrosis affect the photosynthetic potential of the host and therefore may result in considerable yield loss. ToTV is suspected to be transmitted by
whiteflies, and _T. vaporariorum_ has recently been confirmed as an efficient vector.

Phylogenetic analyses showed that the virus is related to, but distinct from, viruses belonging to the genera _Sequivirus_, _Sadwavirus_, and _Cheravirus_ in the proposed order of the Picornavirales. Another new virus related to ToTV, Tomato marchitez virus (ToMarV), has recently been found in Mexico. ToMarV and ToTV both share unique features that clearly distinguish them from other plant picorna-like viruses. These viruses are likely to represent a new plant virus genus for which the name Torradovirus was recently proposed by the International Committee on Taxonomy of Viruses (ICTV).

Maps
Hungary:
<http://go.hrw.com/atlas/norm_htm/hungary.htm>
Csongrad county:
<http://lazarus.elte.hu/hun/hunkarta/varme/cso/cson.gif>
Pictures
ToTV symptoms:
<http://www.deruiterseeds.com/files/Files/PDF/Microsoft_Word_-_Torrado_Marchitez_Virus_website_071001.pdf

ToTV particles, electron micrograph:
<http://www.seedquest.com/News/releases/2007/graphics/18419a.jpg>
_T. vaporariorum_:
<http://www.apsnet.org/online/feature/whitefly/view.asp?ID=404>
Links
Characterisation of ToTV:
<http://www.springerlink.com/content/qk2617331j112m4p/fulltext.pdf>
Information on torrado disease research:
<http://archives.eppo.org/EPPOReporting/2007/Rse-0707.pdf>
Characterisation of ToMarV:
<http://www.springerlink.com/content/gj515nlw824g7323/>
Proposed order of Picornavirales:
<http://www.picornavirales.org>
Information on and viruses transmitted by _T. vaporariorum_:
<http://www.apsnet.org/online/feature/whitefly/>
ICTV virus taxonomy index:
<http://www.ncbi.nlm.nih.gov/ICTVdb/Ictv/index.htm>
EPPO pathogen information:
<http://www.eppo.org/QUARANTINE/quarantine.htm> - Mod.DHA]

[see also in the archive:
2007
---
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]

 

 

 

 

The news item on this page is copyright by the organization where it originated - Fair use notice

Other news from this source


Copyright © SeedQuest - All rights reserved