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International Society for Infectious Diseases
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International Society for Infectious Diseases <http://www.isid.org>
September 24, 2007
Source: North Queensland Register / FarmOnline [edited]
<http://nqr.farmonline.com.au/news_daily.asp?ag_id=45649>
Tasmania's Department of Primary Industries and Water (DPIW) has
confirmed the presence of _Wheat streak mosaic virus_ [WSMV] in
the Apple Isle [Tasmania] for the 1st time. It follows survey,
sampling, and testing work by the DPIW.
According to DPIW biosecurity and product integrity division
general manager, Alex Schaap, the department also surveyed for
the existence of the primary vector of the virus, the wheat curl
mite, and found it is widely distributed throughout Tasmania.
"The presence of both virus and vector indicate likely broad
distribution of the virus in the State," Mr Schaap said.
"It is difficult to predict the impact of the virus on
Tasmania's cereal crops. But, given the widespread nature of the
virus, its previous presence in the State, and no obvious
manifestation of disease to this date, the impacts may be low in
Tasmania. Only time will tell."
The Tasmanian cereal and grains industry was last week [17-23
Sep 2007] advised of the confirmation of WSMV presence and DPIW
will provide additional management advice to growers as needed.
As the virus is present throughout [mainland] Australia, there
are no trade ramifications with this confirmation.
--
Communicated by:
ProMED-mail
<promed@promedmail.org>
[_Wheat streak mosaic virus_ (WSMV; genus _Tritimovirus_, family
_Potyviridae_) is prevalent in North America, Russia, Eastern
Europe, and has recently been reported from Australia (2003) and
Argentina. It is spread by the wheat curl mite _Aceria tulipae_.
Larvae acquire the virus by feeding on infected plants and
remain infectious for approximately a week. The virus is not
transmitted congenitally to the progeny of the vector. WSMV can
also be mechanically transmitted and seed transmitted at a very
low level. It infects wheat, maize (some cultivars), grasses,
and also oats and barley in experimental inoculations. Heavy
infection of WSMV can cause complete crop failure in wheat.
Control of the mite vector is difficult but disease management
may include controlling volunteer wheat and grassy weeds to
minimise inoculum.
Maps
Australia:
<http://www.ga.gov.au/image_cache/GA4073.jpg>
Tasmania:
<http://www.ozhorizons.com.au/tas/map.htm>
Pictures
_Wheat streak mosaic virus_, leaf symptoms <http://www2.dpi.qld.gov.au/images/8658.jpg>
Wheat curl mite
<http://www.nwroc.umn.edu/Cropping_Issues/2006/Issue8/wht_curl_mite.jpg>
Links
Tasmanian Government media release:
<http://www.media.tas.gov.au/release.php?id=21997>
Wheat streak disease factsheet:
<http://www.agric.wa.gov.au/pls/portal30/docs/FOLDER/IKMP/PW/PH/DIS/CER/FS005_2003.PDF>
Wheat streak disease information with pictures:
<http://plantpathology.tamu.edu/Texlab/Grains/Wheat/wsmv.html>
_Wheat streak mosaic virus_ taxonomy and description:
<http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/00.057.0.06.001.htm>
DPIW:
<http://www.dpiw.tas.gov.au/inter.nsf/Home/1?Open>.
- Mod.DHA]
[see also in the
archive:
Stripe rust, wheat & wheat streak mosaic - Australia (SA, WA)
20070830.2860
2006
----
Wheat streak mosaic virus - Australia (WA) (02) 20060914.2601
Wheat streak virus - USA 20060608.1606 Wheat streak mosaic virus
- Australia (WA): 1st Report 20060514.1364
2005
----
Wheat streak mosaic - Australia (NSW) 20051029.3159
2004
----
Wheat streak mosaic virus - Argentina: 1st report 20040922.2614
2003
----
Wheat streak mosaic, first report - Australia (Canberra)
20030417.0941] |
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