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: Sat 18 Feb 2023
Source: Times of India [summ. Mod.DHA, edited]
https://timesofindia.indiatimes.com/city/chandigarh/weed-linked-to-wheat-behind-virus-that-stunts-paddy/articleshow/98032800.cms
Scientists from Haryana Agricultural University have found that the dwarfing disease in paddy crops in the country is not only caused by _Southern rice black streaked dwarf virus_ (SRBSDV), but also by _Rice gall dwarf virus_ (RGDV). Information has also been obtained on the host range of these viruses.
SRBSDV infection has been found to be more prevalent in the disease, and this virus also affects some weeds in local wheat crops, which is a concern. There has been no instance of the virus infecting wheat in the area. Therefore, farmers should destroy weeds in wheat fields to reduce the risk of dwarfing disease in paddy crops.
The scientists continually record the distribution and spread of the viruses. They recommend regular sanitary measures for fields and irrigation drains to prevent further spread of the disease.
--
communicated by:
ProMED
[Symptoms of black streaked dwarf disease (BSDD) of rice include darkening and distortion of leaves, black streaked tumours along leaf veins, as well as severe stunting of plants. BSDD due to _Rice black streaked dwarf virus_ (RBSDV; genus _Fijivirus_) has been known to cause serious crop losses in South East Asia. RBSDV also affects some other gramineous hosts including maize, wheat, oat, and barley. It is spread by planthoppers including _Laodelphax striatellus_ and _Unkanodes_ species.
_Southern rice black streaked dwarf virus_ (SRBSDV; genus _Fijivirus_) has been identified more recently and is now considered an emerging BSDD pathogen in Asia. It is transmitted by the white-backed planthopper (WBPH; _Sogatella furcifera_), which is not a vector of RBSDV, while the RBSDV vector _L. striatellus_ cannot spread SRBSDV. SRBSDV can also affect maize, sorghum, and several grasses as additional crop or reservoir hosts.
_Rice gall dwarf virus_ (RGDV; genus _Phytoreovirus_) is spread by the leafhopper _Recilia dorsalis_. It is known to occur in coinfections, for example with _Rice stripe mosaic virus_ (genus _Cytorhabdovirus_), which shares the same vector. RGDV also affects a range of cereal crops and grasses, causing severe stunting, leaf galls, and severe reduction of grain yield.
Disease management for rice viruses may include cultural practices, vector control, and use of cultivars with resistance to the virus, the vector, or both. High vector numbers are often associated with outbreaks of the viruses they transmit. This is a major concern in the region where rice crops are frequently affected by viruses and their insect vectors (see previous ProMED posts in the archives).
Maps
India (with states):
https://www.worldometers.info/img/maps/india_physical_map.gif
Asia, overview:
https://www.worldatlas.com/img/areamap/continent/asia_map.gif
Pictures
BSDD:
https://vtv1.mediacdn.vn/thumb_w/650/2017/5-54269-1502337429965.jpg
RBSDV symptoms:
https://www.siftdesk.org/articles/images/615/1.png,
https://www.insectimages.org/browse/detail.cfm?imgnum=5356975,
https://www.forestryimages.org/browse/detail.cfm?imgnum=5356974 and
https://s3-eu-west-1.amazonaws.com/ppreviews-plos-725668748/1283785/preview.jpg
SRBSDV symptoms:
https://www.mdpi.com/viruses/viruses-04-00167/article_deploy/html/images/viruses-04-00167-g010.png,
https://bsppjournals.onlinelibrary.wiley.com/cms/asset/db44be7c-1be6-49de-86ab-d796b26a8e04/ppa12630-fig-0001-m.jpg,
https://ricehop.files.wordpress.com/2010/01/pic-21.gif,
https://iasbaba.com/wp-content/uploads/2022/08/dw.jpg and
https://www.frontiersin.org/files/Articles/637382/fsufs-05-637382-HTML/image_m/fsufs-05-637382-g002.jpg
SRBSDV particles, electron micrographs:
https://bsppjournals.onlinelibrary.wiley.com/cms/asset/ad02a0a2-7078-42fe-82fd-03899f368592/ppa12630-fig-0002-m.jpg
RGDV symptoms:
https://www.dpvweb.net/dpvfigs/d296f01.jpg,
https://www.dpvweb.net/dpvfigs/d296f02.jpg (galls) and
https://www.frontiersin.org/files/Articles/834712/fmicb-13-834712-HTML/image_m/fmicb-13-834712-g001.jpg (& rice stripe mosaic)
Links
SRBSDV, characterisation & information:
https://doi.org/10.1111/ppa.12630,
https://doi.org/10.3389/fmicb.2013.00270,
https://doi.org/10.1186/s12985-017-0815-4 and
https://doi.org/10.1079/pwkb.20167800101
RBSDV information:
https://www.dpvweb.net/dpv/showdpv/?dpvno=135 and
https://doi.org/10.1111/mpp.12946
RGDV information:
https://www.dpvweb.net/dpv/showdpv/?dpvno=296,
https://doi.org/10.3389/fmicb.2022.834712,
https://doi.org/10.3389/fmicb.2013.00206,
https://doi.org/10.1079/cabicompendium.47607 and
https://doi.org/10.1038/s41467-019-08860-4
Information on phytoreoviruses:
https://viralzone.expasy.org/628?outline=all_by_species,
https://doi.org/10.1006/rwvi.1999.0218, via
https://doi.org/10.1016/B978-0-12-384684-6.00051-3 and
https://doi.org/10.1016/B978-0-12-249951-7.50013-4
Review of rice viruses:
https://doi.org/10.1146/annurev.phyto.34.1.249
List of major rice viruses via:
https://www.apsnet.org/edcenter/resources/commonnames/Pages/Rice.aspx
Virus taxonomy via:
https://ictv.global/taxonomy
Information on rice planthoppers via:
http://www.knowledgebank.irri.org/training/fact-sheets/pest-management/insects/item/planthopper (with pictures)
- Mod.DHA]
See Also
2022
---
Yellowing & stunting, rice - India (02): southern rice black-streaked dwarf virus 20220830.8705308
Yellowing & stunting, rice - India: potential causes 20220825.8705229
2017
---
Black streaked dwarf disease, rice - Viet Nam: (TB, NA) 20171005.5363723
2011
---
Black streaked dwarf, rice - Viet Nam: (TT, QT) 20110322.0897
Rough dwarf disease, maize - Kenya: 1st rep. 20110204.0407
2010
---
Rough dwarf, maize - Africa: 1st rep (Uganda) 20100730.2552
Southern rice black streaked dwarf, rice, maize, sorghum - China 20100625.2111
Black streaked dwarf, rice - Viet Nam (02): spread 20100506.1473
Black streaked dwarf, rice - Viet Nam: alert 20100406.1099
2009
---
Black streaked dwarf, rice - China, Viet Nam: new virus 20091217.4263
2003
---
Maize rough dwarf virus, maize - Greece: 1st report 20031115.2840
and additional items on rice viruses in the archives
Topics
Species
