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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 #2122 of 2180 |
Re: C I C L Y News from Honduras

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 Watson and Crick!
The only difference between them and us is that they
didn't choose to work on anything as difficult as
coconut lethal yellowing.

Successful speculation - or scientific discovery -
depends on the availability and reliability of data
and if CICLY members can only get data from newspaper
articles they cannot be blamed for wondering what the
"active" workers are actually doing or thinking.

Perhaps, for a start, Carlos could be asked to let us
know what he has already told delegates at the current
APS Caribbean division meeting in Cancun?

Hugh
====
>
--- Maria Mercedes Roca <mmroca@zamorano.edu> wrote:

> 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 70īs 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 canīt
> 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
> <mailto:dagmar.hanold%40adelaide.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
> <mailto:harrieshc%40yahoo.com> >
> > > Date: 10 May 2007 3:17:45 PM
> > > To: Dagmar Hanold <dagmar.hanold@adelaide.edu.au
> <mailto:dagmar.hanold%40adelaide.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
> <mailto:cicly%40yahoogroups.com> to generate
> > an
> > > exchange of opinions?
> > >
> > > Hugh
> > >
> > > --- Dagmar Hanold <dagmar.hanold@adelaide.edu.au
> <mailto:dagmar.hanold%40adelaide.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
> <mailto:harrieshc%40yahoo.com> >
> > >>> Date: 6 May 2007 4:48:28 PM
> > >>> To: CICLY@yahoogroups.com
> <mailto:CICLY%40yahoogroups.com>
> > >>> Subject: C I C L Y News from Jamaica
> > >>> Reply-To: CICLY@yahoogroups.com
> <mailto:CICLY%40yahoogroups.com>
> > >>>
> > >>> "Sat May 5, 2007
> > >>> Farmers' reluctance stymies efforts to re-grow
> > >> coconuts
> > >>>
>
=== message truncated ===




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Thu May 24, 2007 8:33 am

Hugh Harries <harrieshc@yahoo.com>
hugh.harries
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Message #2122 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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