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<pre>Hi All,

Merry Xmas & Happy New Year.

We are based between Strath & Langhorne Creek in South Australia and have had
trouble with yellowing of older leaves on our trees, primarily with the
Corregiola and a few Nevadillo.
After talking with a few people it appears to be a relatively common thing in
the Fleurieu Peninsula at present.
Various causes have been floated, some being salt problems after a wet winter,
boron and/or manganese deficiency, too much or too little water.

After some investigation we have discovered copperhead cockchafer beetle larvae
in the soil in reasonable numbers which eat the feeder roots and we believe are
the major cause of the problem. There is no damage to the canopy from the adult
beetles.
Tissue testing done a month ago showed no deficiencies within the plants and
irrigation should have been sufficient to prevent any possible salt problems
after the winter rains.

Tissue test results from the affected leaves are yet to be available.

We are treating with an insecticide through the fertigation and also Agriphos to
improve root health. We may also apply a worm casting formulation with a high
microbial count to help restore the balance in the soil treated by insecticide.

I would be interested if any other growers have experienced problems of this or
similar nature, and the conclusions drawn from their investigations.

Helen Morgan
Talinga Grove, SA
www.talinga.com.au



[Non-text portions of this message have been removed]
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<pre>Dear Helen,
We tohave had some problems with yellowing mature leaves from 2 year old
trees, all else seems equal. What chemical didyou use to attack these little
brutes? I did have some previous problems with 2 year old trees in the green
house still in pots and when repotting found that the grubs had eaten most
of the major roots off creating a severe leaf drop. I washed the soil from
the trees and replanted after cutting them back, they all came away OK after
a couple of months.

Sharn
----- Original Message -----
From: D & H Morgan <hmorgan@olis.net.au>
To: <OliveOil@egroups.com>
Sent: Thursday, December 28, 2000 10:15 AM
Subject: [OliveOil] Beetles & Bugs


> Hi All,
>
> Merry Xmas & Happy New Year.
>
> We are based between Strath & Langhorne Creek in South Australia and have
had trouble with yellowing of older leaves on our trees, primarily with the
Corregiola and a few Nevadillo.
> After talking with a few people it appears to be a relatively common thing
in the Fleurieu Peninsula at present.
> Various causes have been floated, some being salt problems after a wet
winter, boron and/or manganese deficiency, too much or too little water.
>
> After some investigation we have discovered copperhead cockchafer beetle
larvae in the soil in reasonable numbers which eat the feeder roots and we
believe are the major cause of the problem. There is no damage to the canopy
from the adult beetles.
> Tissue testing done a month ago showed no deficiencies within the plants
and irrigation should have been sufficient to prevent any possible salt
problems after the winter rains.
>
> Tissue test results from the affected leaves are yet to be available.
>
> We are treating with an insecticide through the fertigation and also
Agriphos to improve root health. We may also apply a worm casting
formulation with a high microbial count to help restore the balance in the
soil treated by insecticide.
>
> I would be interested if any other growers have experienced problems of
this or similar nature, and the conclusions drawn from their investigations.
>
> Helen Morgan
> Talinga Grove, SA
> www.talinga.com.au
>
>
>
> [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
>
>
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<pre>Unless you are 100% sure that the cause of the leaf yellowing is that
beetle then the application of 'an insecticide' through the irrigation
system seems a bit heavy handed. What are the ramifications of this
insecticide, will it kill all living things in the soil? Including those
that are desirable?

There are other ways of dealing with soil borne pests using
biopesticides such as developed by the CSIRO on the following;

http://www.researchresults.csiro.au/rr5/rr5a04.html

Roger Farquhar Hunter Valley

[Non-text portions of this message have been removed]
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<pre>Sharn,
The cockshaffer sp are normally confined to the southern states of Tas,
Vic & SA & primarily feed on grasses. Hence the name 'lawn beetle' &
the usual brew was chlordane or deildrin until they were banned. Their
presence was felt in lawns that were unhealthy ie not well aerated,
drained & deep rooted but over watered & fertilised. Being from NSW the
grub you mention is possibly the Xmas beetle, again these grubs usually
feed on grass roots for 2 years before emerging as beetles & decimating
the native eucalypt trees. If they are in your potting mix then take it
back & get a refund but if you made it yourself you may have to
sterilise the soil maybe by solarisation ie wrap in black plastic in
sunshine & raise the heat and/or composting. These beetles are naturally
occurring & normally no problem particularly to exotics unless the
natural balance has been upset by some other event. I dont think that
the "if it moves shoot it" philosophy will be effective in the long run.

Roger Farquhar

[Non-text portions of this message have been removed]
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<pre>Dear all

There are many causes of leaf yellowing in olive, but remember the life
of an olive leaf is about 2 years then it turns yellow.

When looking at leaf changes - look at the whole tree.

¥ are all leaves paler than other trees - nutrition?
¥ is one side affected - verticillium?
¥ do leaves have yellow spots - herbicides? fungus?

etc

Stan Kailis
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<pre>Dear Sharn, this year I have used an organic type spray of Garlic and
Pyrethrum. While it is not quite as effective as a synthetic type pyrethrum
it has certainly reduced the numbers of thrips. The smell would have been
enough to chase any insect away I am sure! Helen Clausen
-----Original Message-----
From: Sharn Hunkin <sharn@hunterlink.net.au>
To: OliveOil@egroups.com <OliveOil@egroups.com>
Date: Thursday, 28 December 2000 14:10
Subject: Re: [OliveOil] Beetles & Bugs


>Dear Helen,
>We tohave had some problems with yellowing mature leaves from 2 year old
>trees, all else seems equal. What chemical didyou use to attack these
little
>brutes? I did have some previous problems with 2 year old trees in the
green
>house still in pots and when repotting found that the grubs had eaten most
>of the major roots off creating a severe leaf drop. I washed the soil from
>the trees and replanted after cutting them back, they all came away OK
after
>a couple of months.
>
>Sharn
>----- Original Message -----
>From: D & H Morgan <hmorgan@olis.net.au>
>To: <OliveOil@egroups.com>
>Sent: Thursday, December 28, 2000 10:15 AM
>Subject: [OliveOil] Beetles & Bugs
>
>
>> Hi All,
>>
>> Merry Xmas & Happy New Year.
>>
>> We are based between Strath & Langhorne Creek in South Australia and have
>had trouble with yellowing of older leaves on our trees, primarily with the
>Corregiola and a few Nevadillo.
>> After talking with a few people it appears to be a relatively common
thing
>in the Fleurieu Peninsula at present.
>> Various causes have been floated, some being salt problems after a wet
>winter, boron and/or manganese deficiency, too much or too little water.
>>
>> After some investigation we have discovered copperhead cockchafer beetle
>larvae in the soil in reasonable numbers which eat the feeder roots and we
>believe are the major cause of the problem. There is no damage to the
canopy
>from the adult beetles.
>> Tissue testing done a month ago showed no deficiencies within the plants
>and irrigation should have been sufficient to prevent any possible salt
>problems after the winter rains.
>>
>> Tissue test results from the affected leaves are yet to be available.
>>
>> We are treating with an insecticide through the fertigation and also
>Agriphos to improve root health. We may also apply a worm casting
>formulation with a high microbial count to help restore the balance in the
>soil treated by insecticide.
>>
>> I would be interested if any other growers have experienced problems of
>this or similar nature, and the conclusions drawn from their
investigations.
>>
>> Helen Morgan
>> Talinga Grove, SA
>> www.talinga.com.au
>>
>>
>>
>> [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
>>
>>
>
>
>
>**** 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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