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Pest & Disease Control Keep your tree healthy. Find out how?

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  #1  
Old September 3rd, 2005, 02:15 AM
trudyhollinshead
 
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Yellowing leaves

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<pre>I have been off the site for a while and have just rejoined.

See the 3 photos under Hollinshead on the group site. Leaves are
generally yellowing, which then moves to branches and finally the tree
defoliates because it vannot photosynthesise. Leaves are also getting
yellow spots on them as can be seen in the photos.

Can anyone advise what this is so we can remedy please?

Trudy
</pre>
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  #2  
Old September 5th, 2005, 09:30 AM
Mike Wilson
 
Posts: n/a
Re: Yellowing leaves

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<pre>> I have been off the site for a while and have just rejoined.
>
> See the 3 photos under Hollinshead on the group site. Leaves are
> generally yellowing, which then moves to branches and finally the tree
> defoliates because it vannot photosynthesise. Leaves are also getting
> yellow spots on them as can be seen in the photos.
>
> Can anyone advise what this is so we can remedy please?
>
> Trudy
>

Trudy,

I have seen this sort of thing but never been able to pin down exactly what
is the cause. I suspect some form of root problem, but that covers plenty of
options. Do you have any problems with waterlogged soil?

Regards,

Mike Wilson.
Hunter Valley.
</pre>
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  #3  
Old September 5th, 2005, 10:41 AM
rathloganolivestrust
 
Posts: n/a
Re: Yellowing leaves

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<pre>--- In OliveOil@yahoogroups.com, "trudyhollinshead" <hollinshead@h...>
wrote:
> I have been off the site for a while and have just rejoined.
>
> See the 3 photos under Hollinshead on the group site. Leaves are
> generally yellowing, which then moves to branches and finally the tree
> defoliates because it vannot photosynthesise. Leaves are also getting
> yellow spots on them as can be seen in the photos.
>
> Can anyone advise what this is so we can remedy please?
>
> Trudy

Hello Trudy,

We have had the same problem in the past. We found that we had a
infestation of LACEBUG. Maybe you have the same problem. Look under the
spotted leaves to see if you have any bugs.

Regards// Col
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  #4  
Old September 7th, 2005, 02:56 AM
Christa Huber
 
Posts: n/a
Re: Re: Yellowing leaves

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<pre>how can I have a look at the photos? I might have similar problem...
xta

Christa Huber
Leyenda Patria 2866 apt. 901
Montevideo - Uruguay
Tel. (598) 2 7101163

{Moderator Note:

The photos are in the link "Photos" on the left hand menu in the group site.

You get to the site by following this link
http://finance.groups.yahoo.com/group/OliveOil/
and then you will need to sign in with your yahoo membership and password.

From what I have seen in the replies, I hope you don't have the same problem!
Cheers
John Attwood
Co-moderator}

----- Original Message -----
From: "rathloganolivestrust" <rathloganolivestrust@...>
To: <OliveOil@yahoogroups.com>
Sent: Monday, September 05, 2005 6:41 AM
Subject: [OliveOil] Re: Yellowing leaves


> --- In OliveOil@yahoogroups.com, "trudyhollinshead" <hollinshead@h...>
> wrote:
>> I have been off the site for a while and have just rejoined.
>>
>> See the 3 photos under Hollinshead on the group site. Leaves are
>> generally yellowing, which then moves to branches and finally the tree
>> defoliates because it vannot photosynthesise. Leaves are also getting
>> yellow spots on them as can be seen in the photos.
>>
>> Can anyone advise what this is so we can remedy please?
>>
>> Trudy
>
> Hello Trudy,
>
> We have had the same problem in the past. We found that we had a
> infestation of LACEBUG. Maybe you have the same problem. Look under the
> spotted leaves to see if you have any bugs.
>
> Regards// Col
>
>
>
>
>
>
>
> **************************************************
> Post message: OliveOil@yahoogroups.com
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</pre>
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  #5  
Old September 7th, 2005, 04:42 AM
hollinshead@...
 
Posts: n/a
Re: Yellowing leaves

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<pre>No. We are on the side of a hill.
>
>
>
> I have seen this sort of thing but never been able to pin down exactly what
>
> is the cause. I suspect some form of root problem, but that covers plenty of
>
> options. Do you have any problems with waterlogged soil?
>
>
>
> Regards,
>
>
>
> Mike Wilson.
>
> Hunter Valley.
>
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> **************************************************
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> Post message: OliveOil@yahoogroups.com
>
> Subscribe:*** OliveOil-subscribe@yahoogroups.com
>
> Unsubscribe:* OliveOil-unsubscribe@yahoogroups.com
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> Moderators:** OliveOil-owner@yahoogroups.com
>
> **************************************************
>
> SPONSOR: http://www.sadoun.com
>
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> YAHOO! GROUPS LINKS
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> *Visit your group "OliveOil" on the web.
> *
> *To unsubscribe from this group, send an email to:
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  #6  
Old September 8th, 2005, 09:11 AM
ariel023
 
Posts: n/a
Re: Yellowing leaves

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<pre>hii

Yellowing of olive leafs occur from the Verticillium fungii,
causing gradual death of the tree in 3-5 years, or water
stress-heat stress, or lack of nitrogen due to competition
avaialability problems or water-logged soil


My advice: dig around or take out a tree with a tractor and
check the soil and root system (take photos and invite other
specialists and friends for their opinions

Ariel
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  #7  
Old September 8th, 2005, 08:31 PM
Christa Huber
 
Posts: n/a
Re: Re: Yellowing leaves

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<pre>ok - Idid so. went to photos - group logo - but could not find
Hollingshead....
Christa Huber

Christa,

The photos are in the "photos" page. You will have to scroll down, then click on
the "see all" link to see all the photos. They are NOT in the group logo folder
but a sequence of photos all with Hollinshead as the common part of the name.

Hope this helps
John Attwood
Co-moderator

----- Original Message -----
From: "Christa Huber" <xta@...>
To: <OliveOil@yahoogroups.com>
Sent: Tuesday, September 06, 2005 10:56 PM
Subject: Re: [OliveOil] Re: Yellowing leaves


> how can I have a look at the photos? I might have similar problem...
> xta
>
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  #8  
Old September 9th, 2005, 09:13 AM
Mike Wilson
 
Posts: n/a
Re: Yellowing leaves

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<pre>Do you have any problems with waterlogged soil?


> No. We are on the side of a hill.

Ah! Be very careful with this. A sloping block on the side of a hill can
have excellent surface drainage, meaning that the water runs off quickly,
but still have problems with waterlogging. If the soil becomes saturated,
and this tends to happen with medium density clay quite a bit, then all the
air spaces between the soil particles fill with water and the tree starts to
suffer. I've seen this on sloping blocks where we have had a couple of days
of gentle, steady rain (this was a while ago!) and although the rain ran off
nicely, we lost 30-odd trees to root rots due to the clay holding water too
well.

Having said that, I don't really think that the problem that you have is
either Olive Lace Bug as suggested by somebody else, as there doesn't seem
to be any black tar-like stuff on the underside of the leaves, and I'm sure
you checked for that (didn't you?).

The symptoms look like a nutrient deficiency of some sort, and that often
means the root system isn't performing its function well, so either
waterlogged soil, a low pH or a very high pH, or some root fungal problem
are all good contenders. I would echo somebody else's comment and suggest
you call in a local agronomist. A leaf test might give you an idea of what
the deficiency is.

Good luck!

Mike Wilson
Hunter Valley.
</pre>
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  #9  
Old September 10th, 2005, 03:39 PM
Christa Huber
 
Posts: n/a
Re: Yellowing leaves

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<pre>than k you! will do that... the trees are still babies, no tractor needed.
water logged soil might be the problem.

Christa Huber
Leyenda Patria 2866 apt. 901
Montevideo - Uruguay
Tel. (598) 2 7101163
----- Original Message -----
From: "ariel023" <ariel023@...>
To: <OliveOil@yahoogroups.com>
Sent: Thursday, September 08, 2005 5:11 AM
Subject: Re: [OliveOil] Yellowing leaves


> hii
>
> Yellowing of olive leafs occur from the Verticillium fungii,
> causing gradual death of the tree in 3-5 years, or water
> stress-heat stress, or lack of nitrogen due to competition
> avaialability problems or water-logged soil
>
>
> My advice: dig around or take out a tree with a tractor and
> check the soil and root system (take photos and invite other
> specialists and friends for their opinions
>
> Ariel
>
>
>
>
>
> **************************************************
> Post message: OliveOil@yahoogroups.com
> Subscribe: OliveOil-subscribe@yahoogroups.com
> Unsubscribe: OliveOil-unsubscribe@yahoogroups.com
> Moderators: OliveOil-owner@yahoogroups.com
> **************************************************
> SPONSOR: http://www.sadoun.com
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
</pre>
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  #10  
Old September 11th, 2005, 10:15 PM
stazius
 
Posts: n/a
Re: Yellowing leaves

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<pre>Hello all,
we encountered the same problem after a very cold winter. Maybe the
lack of permeability in the soil is responsible (badly drained
ground). Yellow leaves appeared and falled. The diagnosis of the
agricultural technicians was verticilium. We had to replace the tree
(a beautiful 4 years subject). Perhaps we should have disinfect the
hole before to do so.
Sad spectacle (see photo in the folder). The roots were dry whereas
the trunk was quite green. I believe that the verticilium acts by
asphixie starting from the roots. The leaves located at the ends of
the highest branches are the touched first. I have been told to help
the roots with a good liquid fertilizer (Foval or Bressol I guess).
I think a deep (75 cm) ploughing should also provide the roots with
a better breathing.
I hope this may help. I don't expect anyone to experiment such
frustration.

Best regards to all.

Saâd Tazi, olive oil producer
Rabat, Morocco

--- In OliveOil@yahoogroups.com, "Christa Huber" <xta@a...> wrote:
> than k you! will do that... the trees are still babies, no
tractor needed.
> water logged soil might be the problem.
>
> Christa Huber
> Leyenda Patria 2866 apt. 901
> Montevideo - Uruguay
> Tel. (598) 2 7101163
> ----- Original Message -----
> From: "ariel023" <ariel023@z...>
> To: <OliveOil@yahoogroups.com>
> Sent: Thursday, September 08, 2005 5:11 AM
> Subject: Re: [OliveOil] Yellowing leaves
>
>
> > hii
> >
> > Yellowing of olive leafs occur from the Verticillium fungii,
> > causing gradual death of the tree in 3-5 years, or water
> > stress-heat stress, or lack of nitrogen due to competition
> > avaialability problems or water-logged soil
> >
> >
> > My advice: dig around or take out a tree with a tractor and
> > check the soil and root system (take photos and invite other
> > specialists and friends for their opinions
> >
> > Ariel
> >
> >
> >
> >
> >
> > **************************************************
> > Post message: OliveOil@yahoogroups.com
> > Subscribe: OliveOil-subscribe@yahoogroups.com
> > Unsubscribe: OliveOil-unsubscribe@yahoogroups.com
> > Moderators: OliveOil-owner@yahoogroups.com
> > **************************************************
> > SPONSOR: http://www.sadoun.com
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
</pre>
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