home news forum careers events suppliers solutions markets expos directories catalogs resources advertise contacts
 
News Page

The news
and
beyond the news
Index of news sources
All Africa Asia/Pacific Europe Latin America Middle East North America
  Topics
  Species
Archives
News archive 1997-2008
 

Tomato yellow leaf curl virus in Australia: (VI)


Published Date: 2021-09-16 07:03:16
Subject: PRO/PL> Tomato yellow leaf curl virus - Australia: (VI)
Archive Number: 20210916.8671119

TOMATO YELLOW LEAF CURL VIRUS - AUSTRALIA: (VICTORIA)
*****************************************************
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: Tue 14 Sep 2021
Source: HortiDaily [summ., edited]
https://www.hortidaily.com/article/9355143/tylcv-found-in-northeast-victoria-australia/


The Australian horticultural industry is encouraged to report any _Tomato yellow leaf curl virus_ (TYLCV) symptoms in tomatoes following the detection of the virus in northeastern Victoria. It is reported to cause severe damage to plant leaves resulting in an eventual reduction in crop yield.

Further information on the outbreak from Agriculture Victoria (see link below) states that, in response to the detection of TYLCV, producers of any host plants will be contacted to undertake surveillance over the next 3-6 months. Surveys will occur across the state to investigate potential distribution. Inspections will involve the collection of leaf samples for diagnostic analysis and installation of insect traps. Inspections will start with glasshouse growers and may move to field crops later on.

[Agriculture Victoria additional information:
https://ausveg.com.au/app/uploads/2021/09/TYLCV_September.pdf]

--
Communicated by:
ProMED
<promed@promedmail.org>

[_Tomato yellow leaf curl virus_ (TYLCV; genus _Begomovirus_) originates from the Middle East and is one of the most damaging viruses of tomato worldwide. Field cropping of tomatoes has been abandoned in some areas due to TYLCV. The virus belongs to the tomato leaf curl and yellow leaf curl clades of the genus. Known species in these clades cause similar diseases on solanaceous and other crops and are considered to be the biggest constraint to solanaceous and cucurbit crops, both in terms of yield losses (up to 100 percent in tomato) and loss of fruit quality. TYLCV symptoms on tomato may be confused with some nutritional or environmental problems; they include interveinal yellowing and distortion of leaves; stunting and distortion of plants; withering and early abortion of flowers. Any fruits that may still be produced are not fit for consumption.

The virus is transmitted in a persistent manner by the silverleaf whitefly (_Bemisia tabaci_ biotype B). TYLCV can also be transmitted by mechanical inoculation (poorly), plant material (such as infected tomato transplants), and by grafting, but is not transmitted by seed or contact between plants. Tomato cultivars with increased levels of resistance or tolerance are available. Transgenic tomato plants incorporating TYLCV capsid protein genes have been found to be resistant to the virus.

Control of begomoviruses is particularly difficult in open field crops due to the widespread presence and wide host range of the vectors. Whiteflies in themselves are serious pests of many vegetable crops; if virus sources are available locally, high vector numbers are often reflected in high levels of the viral diseases they transmit. Disease management may include pathogen exclusion, vector control, elimination of possible pathogen and/or vector reservoirs, as well as use of resistant crop cultivars, if available.

Novel viruses have been shown to emerge from recombination events during co-infections of some of the viruses in the two leaf curl clades. The new recombinant viruses are often more aggressive and have a widened host range, compared to each of the partners, posing an increased risk to solanaceous and cucurbit crops worldwide.

Maps
Australia (with states):
https://www.nationsonline.org/maps/australia-political-map.jpg and
http://healthmap.org/promed/p/288

Pictures
TYLCV symptoms on tomato:
https://www.lsuagcenter.com/~/media/system/0/e/b/6/0eb68da93be56174506675198505a8b5/tylcv1.jpg,
https://c1.staticflickr.com/9/8057/8226402877_9abf151b5b_b.jpg,
https://www.plantmanagementnetwork.org/pub/php/research/2008/TYLCV/image/TYLCV2.jpg,
https://www.agric.wa.gov.au/sites/gateway/files/TYLCV%203%20bush.jpg, and
https://media.padil.gov.au/Species/136657/3489-large.jpg (affected field)
Photo gallery of symptoms of different begomoviruses:
http://www.forestryimages.org/browse/TaxImages.cfm?fam=651&genus=Begomovirus
Whiteflies:
https://www.planetnatural.com/wp-content/uploads/2012/12/whitefly.jpg and
https://www.pinpointpestcontrol.com/images/whitefly-on-plant.jpg

Links
Information on TYLCV:
https://gd.eppo.int/taxon/TYLCV0,
https://www.cabi.org/isc/datasheet/55402,
https://www.agric.wa.gov.au/plant-biosecurity/tomato-yellow-leaf-curl-virus-declared-pest-0,
https://www2.ipm.ucanr.edu/agriculture/tomato/tomato-yellow-leaf-curl/,
https://www.padil.gov.au/pests-and-diseases/pest/main/136657/3489,
http://www.ipm.ucdavis.edu/PMG/r783103311.html, and
https://doi.org/10.3389/fpls.2018.01198 (germplasm resistance)
Information on leaf curl viral diseases on different hosts:
http://www.oisat.org/pests/diseases/viral/leaf_curl__virus.html and via
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/tomato-leaf-curl-virus
Virus taxonomy via:
https://talk.ictvonline.org/taxonomy/
Information on whiteflies:
http://www.issg.org/database/species/ecology.asp?fr=1&si=106 and via
https://projects.ncsu.edu/cals/course/ent425/text18/plantvectors.html
- Mod.DHA]

See Also

2020
----
Tomato leaf curl New Delhi virus, zucchini - France: 1st rep (LP, PR) 20201029.7898960
Begomoviruses, basil - Uganda: new pathogens 20200406.7192712
Begomoviruses, vegetable crops - Thailand: survey & new virus 20200228.7032655
2019
----
Tomato leaf curl New Delhi virus, cucurbits - Portugal: 1st rep (FA,AC) 20190906.6658287
2018
----
Undiagnosed leaf curl virus, tomato seed - Egypt 20181012.6086559
Leaf curl viruses, tomato & cucurbits - Italy: (SC) 20180319.5697141
2015
----
Vegetable viruses - Spain: (AN) alert 20151204.3839034
2014
----
Tomato yellow leaf curl virus - Ghana: (TV) 20140717.2616753
2011
----
Vegetable viruses - Australia: (WA, QL) 20110314.0817
Tomato yellow leaf curl, cowpea - China: new host, (SH) 20110121.0244
2010
----
Tomato yellow leaf curl virus - Spain: (AL) 20100923.3444
2009
----
Tomato yellow leaf curl virus - Australia (QL) 20090605.2079
and additional items on begomoviruses in the archives

 



More news from: ISID (International Society for Infectious Diseases)


Website: http://www.isid.org

Published: September 17, 2021

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

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

  Archive of the news section

 

 


Copyright @ 1992-2024 SeedQuest - All rights reserved