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CICLY · Lethal Yellowing Disease of Coconut Palm

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C I C L Y News from Honduras   Message List  
Reply | Forward | Delete Message #2119 of 2180 |

Dear Hugh,

 

Your comment did the trick –  maybe spur us into action to defend ourselves?  Our interest in lethal yellow has not broken down at all, but at this point we can only speculate and scientists feel uncomfortable speculating too much – right?. As we speak, Carlos Oropeza is at the APS Caribbean division meeting in Cancun, Mexico, giving a presentation on our current knowledge on this – which is by the way no more advanced that what it was a few years ago, despite all the work that we have put into trying to answer this very elusive question.

 

I know Michel Dollet has his own very interesting views that the  dwarfs used for the hybrid production in the 70´s in Jamaica where not really dwarfs, so we should not be surprised this is happening… did I get this wrong Michel ? Apologies if I got the wrong end of the stick  - and maybe you can clarify your point for me. We in Honduras have done exhaustive work with Nigel Harrison to study the genetic variability of the LY phytoplasma and have found very little  variability in Honduras. This is apparently  not the case in Mexico and Jamaica, yet in all three countries hybrids and dwarf continue to succumb to LY. I have also reported that our main killer in Honduras is now bud rot and to necessarily LY, yet most farmers can´t tell one disease from the other and assume everything that kills a palm is LY.

 

 I also have to report that I seldom see Myndus in the field, and believe me, I look for it al the time. Nor, do I see any other obvious insect vector in huge quantities like we see for example, white fly associated with geminiviruses, where literally, you see clouds of them. You mentioned external circumstances – which  do you have in mind ? Hurricanes? Droughts or floods? Climate change? Any others????  

 

Best regards,

 

Maria

 

Maria Mercedes Roca

Zamorano University

Honduras

 


From: CICLY@yahoogroups.com [mailto:CICLY@yahoogroups.com] On Behalf Of Hugh Harries
Sent: Lunes, 21 de Mayo de 2007 04:48 p.m.
To: CICLY@yahoogroups.com
Subject: Re: Fwd: C I C L Y News from Jamaica

 

Dagmar

It seems I was wrong to think that CICLY members might
have an opinion on your question "does this . . . mean
that dwarf and hybrid resistance has broken down?"

It is their interest in lethal yellowing disease that
appears to have broken down. But just wait until
another Latin American and/or West African country
becomes host to the next epidemic outbreak!

My own opinion is that because there have always been
examples of individual dwarf and hybrids dying from LY
they all vary in their level of resistance. None are
immune and when infection does occur none live long
enough to be called tolerant.

Resistance and susceptibility are like the two faces
on a spinning coin - which way it lands depends on
external circumstances.

So what happens when more than a few - perhaps most
dwarf and hybrid varieties in Jamaica die from LY
while some countries - Cuba and Dominican Republic -
can co-exist with this disease and another country -
Ivory Coast - remain free even when it is on their
border with Ghana for years?

It must be the external circumstances.

What has changed in Jamaica since the successful 60s
and 70s? Has the phytoplasma mutated? Has the vector
become more effective? Has another vector joined the
attack?

I don't suppose CICLY members have opinions on these
possibilities either.

But just wait until another Latin American and/or West
African country becomes host to the next epidemic
outbreak!

Regards

Hugh
====

--- Dagmar Hanold <dagmar.hanold@adelaide.edu.au>
wrote:

> Hello all,
> I would appreciate any comments or information on
> the issue below.
> Thanks and regards,
> Dagmar Hanold
>
> Begin forwarded message:
>
> > From: Hugh Harries <harrieshc@yahoo.com>
> > Date: 10 May 2007 3:17:45 PM
> > To: Dagmar Hanold <dagmar.hanold@adelaide.edu.au>
> > Subject: Re: C I C L Y News from Jamaica
> >
> > Hi Dagmar
> >
> > It is still a matter of opinion. Why don't you
> send
> > your question to cicly@yahoogroups.com to generate
> an
> > exchange of opinions?
> >
> > Hugh
> >
> > --- Dagmar Hanold <dagmar.hanold@adelaide.edu.au>
> > wrote:
> >
> >> Dear Hugh,
> >>
> >> I may have missed previous stories on this - but
> >> does this paragraph
> >> below
> >>
> >>>> It says the continued failure is linked to
> >> farmers' reluctance to
> >>>> plant the Malayan Dwarf and Maypan hybrid,
> which
> >> are still dying from
> >>>> lethal yellowing disease.
> >>
> >> mean that dwarf and hybrid resistance has broken
> >> down?
> >>
> >> Kind regards,
> >> Dagmar Hanold
> >>
> >>
> >>
> >>> From: "hugh.harries" <harrieshc@yahoo.com>
> >>> Date: 6 May 2007 4:48:28 PM
> >>> To: CICLY@yahoogroups.com
> >>> Subject: C I C L Y News from Jamaica
> >>> Reply-To: CICLY@yahoogroups.com
> >>>
> >>> "Sat May 5, 2007
> >>> Farmers' reluctance stymies efforts to re-grow
> >> coconuts
> >>>
> >>> The Coconut Industry Board, which is staging
> the
> >> annual general
> >>> meeting of the Growers Association on Saturday,
> >> has indicated that it
> >>> is experiencing problems with its planting
> >> programmes.
> >>>
> >>> It says the programmes introduced as part of
> >> efforts to maintain the
> >>> number of trees which existed immediately
> before
> >> the latest outbreak
> >>> of yellow leafing in 1997 have seen little
> >> success.
> >>>
> >>> According to the Board, it did not achieve its
> >> targeted planting of
> >>> 100,000 seedlings per year, and this has been
> the
> >> experience every
> >>> year since the establishment of the programmes.
> >>>
> >>> It says the continued failure is linked to
> >> farmers' reluctance to
> >>> plant the Malayan Dwarf and Maypan hybrid,
> which
> >> are still dying from
> >>> lethal yellowing disease.
> >>>
> >>> Planting under the old programme should have
> >> ended in 2004, but the
> >>> Board decided that the period should be
> extended.
> >>>
> >>> This, as the targeted 300,000 seedlings over
> the
> >> five years had not
> >>> been achieved.
> >>>
> >>> Under the programme, the Board is continuing to
> >> offer 60,000 seedlings
> >>> per year and fertilizer for 80 per cent of the
> >> seedlings."
> >>>
> >>>
> >>
> >
>
http://www.rjr94fm.com/news/story.php?category=2&story=35569
> >>>
>
> Dr Dagmar Hanold
> Plant Virology
> School of Agriculture, Food and Wine
> The University of Adelaide, Waite Campus
> Glen Osmond SA 5064, AUSTRALIA.
> Tel: +61 8 8303 7307; Fax: +61 8 8303 7109.
> E-mail: dagmar.hanold@adelaide.edu.au
> website:
>
http://www.agwine.adelaide.edu.au/research/plant/path/pv
> CRICOS Provider Number 00123M
> _________________________________________________

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Tue May 22, 2007 4:43 am

"Maria Mercedes Roca" <mmroca@zamorano.edu>
mmroca@zamorano.edu
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Message #2119 of 2180 |
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Dear Hugh, Your comment did the trick - maybe spur us into action to defend ourselves? Our interest in lethal yellow has not broken down at all, but at this...
Maria Mercedes Roca
mmroca@zamorano.edu
Send Email
May 22, 2007
7:46 am

Dear Maria Mercedes Please allow me to disagree when you say "we can only speculate and scientists feel uncomfortable speculating too much". Tell that to...
Hugh Harries
hugh.harries
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May 24, 2007
8:35 am

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