October 31, 2011

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: Wed 26 Oct 2011

Source: EnsenadaHoy.com, El Vigia report [in Spanish, trans. Corr.SB, summ. Mod.DHA, edited] <http://ensenadahoy.com/noticias/ver/1C00/>

Rare disease affects onion crops

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As a result of an as yet unidentified disease, onion crops in the region of San Quintin [Baja California] were reduced by 50 percent.

Onion growers explained that the plants "got sick" when in full development. The problem was sudden drying of the plant, which slowed crop development. They still do not have the results from samples that were sent to the Local Board of Health in Ensenada.

The situation affected a large percentage of the total area planted this year, which was approximately 500 hectares [1236 acres].

[Byline: Enrique Rojas]

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Communicated by:

ProMED-mail

<promed@promedmail.org>

[The symptoms described above could be due to a number of pathogens known to affect onion. Reliable diagnosis is essential before suitable disease management strategies can be designed.

Maps

Mexico:

<http://www.mexico.us/map.htm> and

<http://healthmap.org/r/1o4I>

Baja California:

<http://travelamap.com/mexico/bajacalifornia_I.htm>

Pictures

Photo gallery of onion diseases:

<http://www.ipmimages.org/browse/AreaSubs.cfm?area=86>

Links

List of major diseases and pathogens of onion (and garlic):

<http://www.apsnet.org/publications/commonnames/Pages/OnionandGarlic.aspx>

Information on some onion diseases:

<http://www.omafra.gov.on.ca/english/crops/facts/95-063.htm> and <http://vegetablemdonline.ppath.cornell.edu/factsheets/Onions_List.htm>

Global Plant Clinic diagnostics (free for eligible developing

countries):

<http://www.cabi.org/Default.aspx?site=170&page=3101>. - Mod.DHA]

[see also:

Undiagnosed disease, onion - Nigeria: (KE), RFI 20110117.0196 Purple blotch & anthracnose, onion - India: (MH) 20110103.0024 2010

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Bacterial blight, onion - Argentina 20100709.2288 Undiagnosed disease, onion - Mexico: (MR), RFI 20100213.0509

2009

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Fungal blight, onion - India: (MH) 20090103.0024

2008

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Iris yellow spot virus, onion - New Zealand, Serbia: 1st rep.

20080826.2663

and older items on onion diseases in the archives]

Website: http://www.isid.org

Published: October 31, 2011