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<pre>We have Corregiola and Nevadillo trees just over 2 years old in The Hunter
Valley NSW Australia.

Some of the Nevadillo trees and one or two nearby Corregiolas have developed
split bark on some of the branches.

It looks like a blister has developed and then burst.

It doesn't look like anything we've seen in the Californian Olive book or Burr's
Australian olive book as regards pests or diseases...except maybe sunburn
?...but then why don't all the trees have it, if that's what it is ...

Any ideas as to what this might be would be appreciated......and what to do
about it !!

Best regards

Alan & Judith
"Woonona"
Hunter Valley
Australia


[Non-text portions of this message have been removed]
</pre>
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<pre>> We have Corregiola and Nevadillo trees just over 2 years old in The Hunter
Valley NSW Australia.
>
> Some of the Nevadillo trees and one or two nearby Corregiolas have
developed split bark on some of the branches.
>
> It looks like a blister has developed and then burst.
>
> It doesn't look like anything we've seen in the Californian Olive book or
Burr's Australian olive book as regards pests or diseases...except maybe
sunburn ?...but then why don't all the trees have it, if that's what it is
...
>
> Any ideas as to what this might be would be appreciated......and what to
do about it !!
>
> Best regards
>
> Alan & Judith
> "Woonona"
> Hunter Valley
> Australia

Alan & Judith,

Can we safely assume that these are not the trees with the oil problem from
last year?

If not, then it does sound like sunburn, and it does seem to be one of those
random things ... I have little bits of sunburn on some trees but not all
trees are affected.

I haven't bothered to do anything with mine as it seems too minor to worry
about, but I seem to remember somebody saying that you should paint the
trunks with white emulsion paint to reflect the sunshine and protect the
trees ... or is this an old wives tale?

Mike Wilson.
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<pre>Generally speaking young vigorously growing trees such as eucalypts can
develop vertical splits during periods of fast growth after normal
flexing in winds. These can be successfully treated by a proprietory
wound dressing to prevent the transmission of disease to the tree.
Another reason esp. for olives is a lack of calcium caused by a lack of
boron resulting in a weakness or absence of bark. Leaf analysis is the
first step to determine or eliminate these possible causes to these symptoms.

The white paint that Mike W refers to might be whitewash ie slaked lime
& salt. This would have the effect of providing calcium, cleansing the
surface & deterring ground dwelling insects from climbing up the trunk.
Apparently its an old Greek way, every spring do the house, church,
trees, wife etc. A building recipe for whitewash is 1kg hydrated lime,
20g salt, 14g alum in 2.25 litres water. I dont know if that is what
they use in Greece, maybe Stan K can give us a pointer after he returns
from his 'fishing' expedition.

With regards to sunburn, Australia does not have more sun than say Egypt
& in summer probably less than Greece, Italy, Spain with regards to the
latitude. There is no ozone hole over Australia, only Antarctica so the
blistering is probably due to other causes.

Roger Farquhar

[Non-text portions of this message have been removed]
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<pre>Thanks Mike,
No, it is not the same trees that were affected by the oil.
Some are quite extensively affected and others not at all. Of course, you
are always welcome to have a look for yourself if you are over this way.
----- Original Message -----
From: Mike Wilson <mike.wilson@hunterlink.net.au>
To: <OliveOil@egroups.com>
Sent: Friday, 29 December 2000 9:18
Subject: Re: [OliveOil] Bark splitting syndrome


>
> > We have Corregiola and Nevadillo trees just over 2 years old in The
Hunter
> Valley NSW Australia.
> >
> > Some of the Nevadillo trees and one or two nearby Corregiolas have
> developed split bark on some of the branches.
> >
> > It looks like a blister has developed and then burst.
> >
> > It doesn't look like anything we've seen in the Californian Olive book
or
> Burr's Australian olive book as regards pests or diseases...except maybe
> sunburn ?...but then why don't all the trees have it, if that's what it is
> ...
> >
> > Any ideas as to what this might be would be appreciated......and what to
> do about it !!
> >
> > Best regards
> >
> > Alan & Judith
> > "Woonona"
> > Hunter Valley
> > Australia
>
> Alan & Judith,
>
> Can we safely assume that these are not the trees with the oil problem
from
> last year?
>
> If not, then it does sound like sunburn, and it does seem to be one of
those
> random things ... I have little bits of sunburn on some trees but not all
> trees are affected.
>
> I haven't bothered to do anything with mine as it seems too minor to worry
> about, but I seem to remember somebody saying that you should paint the
> trunks with white emulsion paint to reflect the sunshine and protect the
> trees ... or is this an old wives tale?
>
> Mike Wilson.
>
>
>
> **** RECIPES **** http://www.egroups.com/group/OliveOilRecipes
>
> ************************************************** ***
> Addresses:
> Post message: OliveOil@egroups.com
> Subscribe: OliveOil-subscribe@egroups.com
> Unsubscribe: OliveOil-unsubscribe@egroups.com
> List owner: OliveOil-owner@egroups.com
> URL to this page: http://www.egroups.com/group/OliveOil
>
>
</pre>
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<pre>> Thanks Mike,
> No, it is not the same trees that were affected by the oil.
> Some are quite extensively affected and others not at all. Of course, you
> are always welcome to have a look for yourself if you are over this way.

Judith,

I'll give you a ring.

Mike.
</pre>
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<pre>Alan and Judith describe very accurately the symptoms of what I suspect has
killed one of my Sevillano trees and near killed another. These two trees
are isolated in a batch of 60 other Sevillanos in a block of about 500
olives of other varities. All the trees have been given similar treatment
planting , irrigation ,fertilizing-sheep manure] and appeared otherwise
healthy until the development of lumpy bark with the addition of short
vertical slits or cracks appearing over the whole trunk and partway along
the major branches.
I do not suspect sunburn as has been suggested but tend to think it is
nutritional, either deprived or excessive.
Any suggestions or similar experiences may help both myself and the
Leslie's.

Alan Watt, Tanja Olives


> -----Original Message-----
> From: A& J Leslie [mailto:woonona.bulga@bigpond.com]
> Sent: Wednesday, 27 December 2000 7:57
> To: Olive Group
> Subject: [OliveOil] Bark splitting syndrome
>
>
> We have Corregiola and Nevadillo trees just over 2 years old in
> The Hunter Valley NSW Australia.
>
> Some of the Nevadillo trees and one or two nearby Corregiolas
> have developed split bark on some of the branches.
>
> It looks like a blister has developed and then burst.
>
> It doesn't look like anything we've seen in the Californian Olive
> book or Burr's Australian olive book as regards pests or
> diseases...except maybe sunburn ?...but then why don't all the
> trees have it, if that's what it is ...
>
> Any ideas as to what this might be would be appreciated......and
> what to do about it !!
>
> Best regards
>
> Alan & Judith
> "Woonona"
> Hunter Valley
> Australia
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
> **** RECIPES **** http://www.egroups.com/group/OliveOilRecipes
>
> ************************************************** ***
> Addresses:
> Post message: OliveOil@egroups.com
> Subscribe: OliveOil-subscribe@egroups.com
> Unsubscribe: OliveOil-unsubscribe@egroups.com
> List owner: OliveOil-owner@egroups.com
> URL to this page: http://www.egroups.com/group/OliveOil
>
>
>
</pre>
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<pre>Alan:

Thanks for the comments on the olive fruit set. It appears there are some
consistencies with what we find causes poor fruit set here.

I would also suggest that during bloom development and flowering next year
that you again observe weather and tree condition (as you did this past
year). Also, during bloom, look at the flowers (files attached of perfect
and staminate flowers) and see if there is a preponderance of staminate vs.
perfect flowers - this can suggest some types of tree stress during the
flower development period. Of course, it doesn't take many perfect flowers
to make a crop if they are adequately pollinized and ultimately get
fertilized. However, we have seen groves where almost all flowers are
staminate. Also some years are worse than others.

One other question regarding the blistering bark - are there any herbicides
used in this grove? We've seen symptoms like this when growers have used
2,4-D (I doubt you have used this but still a question)

Steve Sibbett
U.C. Farm Advisor
Phone - office 559.733.6486
Mobil 559.280.0666
FAX 559.734.2708

-----Original Message-----
From: Alan Watt [mailto:wattmeyer@one.net.au]
Sent: Friday, January 05, 2001 11:59 PM
To: OliveOil@egroups.com
Subject: RE: [OliveOil] Bark splitting syndrome




[Non-text portions of this message have been removed]
</pre>
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<pre>Steve,

Thanks, but no, we don't use herbicides and no one near us does either...

Cheers

Alan
----- Original Message -----
From: Steve Sibbett <sibbett@lightspeed.net>
To: <OliveOil@egroups.com>
Sent: Sunday, 7 January 2001 1:26
Subject: RE: [OliveOil] Bark splitting syndrome


> Alan:
>
> Thanks for the comments on the olive fruit set. It appears there are some
> consistencies with what we find causes poor fruit set here.
>
> I would also suggest that during bloom development and flowering next year
> that you again observe weather and tree condition (as you did this past
> year). Also, during bloom, look at the flowers (files attached of perfect
> and staminate flowers) and see if there is a preponderance of staminate
vs.
> perfect flowers - this can suggest some types of tree stress during the
> flower development period. Of course, it doesn't take many perfect flowers
> to make a crop if they are adequately pollinized and ultimately get
> fertilized. However, we have seen groves where almost all flowers are
> staminate. Also some years are worse than others.
>
> One other question regarding the blistering bark - are there any
herbicides
> used in this grove? We've seen symptoms like this when growers have used
> 2,4-D (I doubt you have used this but still a question)
>
> Steve Sibbett
> U.C. Farm Advisor
> Phone - office 559.733.6486
> Mobil 559.280.0666
> FAX 559.734.2708
>
> -----Original Message-----
> From: Alan Watt [mailto:wattmeyer@one.net.au]
> Sent: Friday, January 05, 2001 11:59 PM
> To: OliveOil@egroups.com
> Subject: RE: [OliveOil] Bark splitting syndrome
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
> **** INDUSTRY LINKS **** http://www.egroups.com/Links/OliveOil
>
> ************************************************** ***
> Addresses:
> Post message: OliveOil@egroups.com
> Subscribe: OliveOil-subscribe@egroups.com
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>
>
</pre>
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<pre>Other poss causes may be,

herbicide eg glyphosate can cause splits in bark up to 1/2 years after contact
pathogens within tree entering from unsealed wounds eg pruning, hail
damage, whipper snipper, tractor mowers etc
insufficient chill hours for that cv not kicking off hormones for leaf
growth leading to insufficient shade
excessive nitrogen blocking calcium or lack of calcium, boron

Roger Farquhar

[Non-text portions of this message have been removed]
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<pre>Steve,
Thanks for the tips for next year's flower observation. With your advice and
Mohamed's fullsome posting on fruit set we have plenty of material that will
make observations more meaningful and relevant.
Re the bark splitting syndrome. The only herbicide used has been Glyphosate
[Roundup] for grass management but certainly not 2,4-D. It is unlikely that
the two trees in question have received any more than the 1200 other trees
treated the same way.
I am wondering if Boron deficiency may have something to do with the problem
as parts of our locality are noted for low levels of this element. We have
observed classic manifestations of this problem in Kalamatas, but strangely,
not evenly distributed amongst the grove. Is it possible to have isolated
pockets of Boron deficient soil that will severely affect one tree but not
its neighbour?
Although my reading of a few 'olive texts' mentions nothing about bark
splitting in relation to Boron deficiency I did find in an agricultural
journal this interesting passage on the impact of boron deficiency in
apples. "Dead areas appear on the bark of young wood and external and
internal lesions are found [apple measles]. The bark may be rough and
split". This closely describes the symptoms found on the two affected
olives.
I wonder if the Leslie's property is deficient in boron? I seem to recall
Mike Wilson [also in the Hunter Valley]suggesting his Kalamatas were showing
signs of such deficiencies.
I intend to get a leaf analysis done but should I be taking leaves from the
worst affected plants or their apparently healthy neighbours?
Alan Watt, Tanja Olives

> -----Original Message-----
> From: Steve Sibbett [mailto:sibbett@lightspeed.net]
> Sent: Sunday, 7 January 2001 1:27
> To: OliveOil@egroups.com
> Subject: RE: [OliveOil] Bark splitting syndrome
>
>
> Alan:
>
> Thanks for the comments on the olive fruit set. It appears there are some
> consistencies with what we find causes poor fruit set here.
>
> I would also suggest that during bloom development and flowering next year
> that you again observe weather and tree condition (as you did this past
> year). Also, during bloom, look at the flowers (files attached of perfect
> and staminate flowers) and see if there is a preponderance of
> staminate vs.
> perfect flowers - this can suggest some types of tree stress during the
> flower development period. Of course, it doesn't take many perfect flowers
> to make a crop if they are adequately pollinized and ultimately get
> fertilized. However, we have seen groves where almost all flowers are
> staminate. Also some years are worse than others.
>
> One other question regarding the blistering bark - are there any
> herbicides
> used in this grove? We've seen symptoms like this when growers have used
> 2,4-D (I doubt you have used this but still a question)
>
> Steve Sibbett
> U.C. Farm Advisor
> Phone - office 559.733.6486
> Mobil 559.280.0666
> FAX 559.734.2708
>
> -----Original Message-----
> From: Alan Watt [mailto:wattmeyer@one.net.au]
> Sent: Friday, January 05, 2001 11:59 PM
> To: OliveOil@egroups.com
> Subject: RE: [OliveOil] Bark splitting syndrome
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
> **** INDUSTRY LINKS **** http://www.egroups.com/Links/OliveOil
>
> ************************************************** ***
> Addresses:
> Post message: OliveOil@egroups.com
> Subscribe: OliveOil-subscribe@egroups.com
> Unsubscribe: OliveOil-unsubscribe@egroups.com
> List owner: OliveOil-owner@egroups.com
> URL to this page: http://www.egroups.com/group/OliveOil
>
>
>
</pre>
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