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   Fecha: Thu, 21 Jan 2016 10:40:38 +0000
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 Asunto: PRO/PL> Late blight & undiagnosed virus, potato - Bangladesh: (RP)
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LATE BLIGHT AND UNDIAGNOSED VIRUS, POTATO - BANGLADESH: (RANGPUR)
*****************************************************************
A ProMED-mail post
<http://www.promedmail.org>
ProMED-mail is a program of the
International Society for Infectious Diseases
<http://www.isid.org>
In this posting:
[1] Thakurgaon, Panchagarh districts
[2] Nilphamari district
******
[1] Thakurgaon, Panchagarh districts
Date: Wed 20 Jan 2016
Source: The Daily Star [edited]
<http://www.thedailystar.net/country/late-blight-disease-worries-potato-growers-204247>
Potato growers of Thakurgaon and Panchagarh districts [Rangpur
division] are worried due to attack of late blight disease. Arshed
Ali, Department of Agriculture Extension (DAE), said, "The disease
appeared due to cold and foggy weather. We are suggesting farmers
spray their potato fields once a week."
During a recent visit, many late blight affected potato fields [were
seen]. Frequent use of [fungicides] adds to the production cost, said
several farmers. They said that a portion of the plants got damaged by
the disease [and that] many potato growers of the area faced the same
this [2015/16] season.
23 080 hectares [57 032 acres] of land has been brought under potato
cultivation in Thakurgaon while in Panchagarh, the cultivation area is
8680 hectares [21 450 acres].
[byline: Quamrul Islam Rubaiyat]
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[2] Nilphamari district
Date: Fri 15 Jan 2016
Source: The Financial Express [edited]
<http://old.thefinancialexpress-bd.com/2016/01/15/131217>
Virus and late blight disease have been detected on most of the potato
farmlands of the district. Severity of the disease [has] created deep
alarm among the farmers.
A potato farmer lamented that he may not get 50 per cent of the
production. Another farmer said about 50 per cent [of] plants have
been already affected by late blight disease.
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[Potato late blight (PLB) is caused by the fungus-like organism
(oomycete) _Phytophthora infestans_ and can cause 100 per cent crop
loss. The pathogen can also affect tomato and some other solanaceous
crops. In potato, it affects leaves as well as tubers; in tomato, it
causes lesions and rotting of leaves, stems, and fruits. The disease
is favoured by cool, moist conditions. It can spread rapidly within a
crop and destroy it within a few days. Under favourable conditions,
epidemics in tomatoes may be even more rapid than in potatoes.
PLB is spread by plant material (including plant debris and volunteer
crop plants), mechanical means (including human and insect
activities), wind, and water. Disease management requires an
integrated approach and may include removal of pathogen reservoirs,
crop rotation, preventive fungicide treatments of planting material,
and fungicide sprays of crops.
Late blight is considered an increasing problem worldwide. More
virulent strains with additional fungicide resistances and increased
yield losses are emerging frequently. Farm saved or uncertified seed
tubers have often been reported as sources of PLB outbreaks in the
past. Thus, seed tuber certification schemes have been set up in many
countries. Development of resistant cultivars is being counteracted by
the adaptability of the pathogen. Clean planting stock (potato seed
tubers, tomato seeds, or explants) and management strategies for
fungicide resistance of the pathogen are considered vital to control
PLB outbreaks in the future.
An undiagnosed virus is also mentioned in item 2 above, but it is not
clear what has led to this assumption. Around 40 viruses and viroids
have been reported to affect potato, and a number of them are present
in the region. Reliable molecular diagnosis will be needed to identify
whether a virus as well as PLB is present in the crops described
above.
Maps
Bangladesh:
<http://www.nationsonline.org/oneworld/map/bangladesh_map2.htm> and
<http://healthmap.org/promed/p/16030>
Bangladesh divisions:
<http://en.wikipedia.org/wiki/File:Bangladesh_divisions_english.png>
Bangladesh districts:
<http://www.lged.gov.bd/images/bangladesh-map.jpg>
Pictures
Late blight on potato:
<http://www.potatomuseum.com/images/exblightfieldwithinsert.jpg> and
<http://farm1.static.flickr.com/81/281344513_74bbffe5fe.jpg>
PLB resistant vs. susceptible potato varieties:
<http://cdn.phys.org/newman/gfx/news/2013/keepingpacew.jpg>
Late blight on tomato:
<http://ipm.illinois.edu/ifvn/volume15/images/tomato_late_blight.jpg>
Microscopy of PLB infected cells:
<http://micro.magnet.fsu.edu/optics/olympusmicd/galleries/brightfield/images/potatoblight.jpg>
Photo gallery of some potato virus diseases:
<http://www.ipmimages.org/browse/Areathumb.cfm?area=116>
Links
Information on late blight:
<http://vegetablemdonline.ppath.cornell.edu/factsheets/Potato_LateBlt.htm>,
<http://www.apsnet.org/edcenter/intropp/lessons/fungi/Oomycetes/Pages/LateBlight.aspx>,
<http://academy.fwi.co.uk/Courses/Arable/Potato-pests-and-diseases/Potatoes-Understanding-blight>,
and
<http://www.scri.ac.uk/research/pp/pestanddisease/blightepidemiologyandpopulationbiology>
PLB disease cycle:
<https://research.cip.cgiar.org/confluence/download/attachments/37192494/4f888c445a.jpg?version=1&modificationDate=1274541183000&api=v2>
Late blight information and resources via:
<https://research.cip.cgiar.org/confluence/display/GILBWEB/Home> and
<http://euroblight.net/>
_P. infestans_ taxonomy:
<http://www.indexfungorum.org/Names/NamesRecord.asp?RecordID=232148>
List of major virus and viroid diseases of potato via:
<http://www.apsnet.org/publications/commonnames/Pages/Potato.aspx>
Information on some virus and viroid diseases of potato:
<http://vegetablemdonline.ppath.cornell.edu/factsheets/Virus_Potato.htm>
and
<http://www.ipm.ucdavis.edu/PMG/r607101411.html>
- Mod.DHA]
[See Also:
2015
---
Late blight, potato - Spain: strain Blue13 1st rept, new A1/A2 strains
http://promedmail.org/post/20150317.3237610
Late blight, potato - Nepal: (DN)
http://promedmail.org/post/20150128.3127014
2014
---
Potato viruses - Greenland: 1st reports
http://promedmail.org/post/20141126.2992687
Viruses, seed potatoes - UK: alert
http://promedmail.org/post/20141110.2941885
Late blight, potato - Nigeria, UK
http://promedmail.org/post/20140611.2533396
Late blight, potato & tomato - Canada: strains
http://promedmail.org/post/20140428.2434165
Late blight, potato - Bangladesh: (KH)
http://promedmail.org/post/20140320.2345850
2013
---
Potato viruses - Tanzania: 1st reps
http://promedmail.org/post/20131011.1995931
Late blight, tomato - Oman: (BS)
http://promedmail.org/post/20130603.1752356
Yellow leaf curl & blights, tomato - Pakistan: (SD)
http://promedmail.org/post/20130206.1531086
Late blight, potato: new strains threat
http://promedmail.org/post/20130111.1492024
2012
---
Late blight, potato - UK: strain Green 33
http://promedmail.org/post/20120202.1031230
2010
---
Late blight type A2, potato - Estonia: 1st report
http://promedmail.org/post/20101129.4298
Late blight, potato - Ireland: strain Pink 6
http://promedmail.org/post/20100604.1851
Dickeya, leaf blights, potato - UK, Ireland
http://promedmail.org/post/20100528.1775
Late blight, potato - Ireland: strain Blue13
http://promedmail.org/post/20100212.0505
2009
---
Potato diseases - UK, USA http://promedmail.org/post/20090821.2960
Late blight, potato - UK: sources
http://promedmail.org/post/20090427.1592
Late blight, potato - Algeria: update
http://promedmail.org/post/20090420.1490
Late blight, potato - UK, Bangladesh
http://promedmail.org/post/20090406.1332
and additional items on late blight & potato viruses in the archives]
.................................................sb/dha/mj/sh

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