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<pre>>
> We will be looking at more samples of disease free and infected fruit as
the
> ripening period progresses in NSW and hopefully we can provide a little
more
> insight into Australian experiences with this disease over the next couple
of
> months. In the mean time I would be interested to hear from growers who
have had
> experience with fruit rot disease this year.

Damian,

Last harvest we had a serious infestation of what I believe was anthracnose
(going off the photo in Michael Burr's book) which hit hardest on
Manzanillo. The worst areas were closest to the ground, with the infestation
diminishing the higher up tree we went. Probably 50% of the fruit was
damaged on the worst trees. Not all of this was "rotten", some was just
marked.

We hit the trees with a couple of good sprays of copper hydroxide (Kocide),
one before flowering, once after fruitset. A leaf analysis some 2 months
later told me I had toxic levels of copper on the tree, but I feel that
might be remanent spray. I suspect the pre-flowering one did the trick, but
this was a bit of a "belt & braces" approach.

The result is that we have a much smaller crop, which was due to pruning,
biennial bearing and other factors, but hardly any diseased fruit. Last year
gave us 15kg per tree, much of it marked. This year is only 2kg, but
probably as much good, clean fruit for pickling as last year.
I haven't seen any at all in the Frantoio & Correggiola. Tiny amount in
Sevillano & Azapa. 1% at the worst in Manzanillo.

My feeling is that the timing of the spray is going to prove to be vital. Do
you have any information as to when the optimum effective period is likely
to be?

Regards,

Mike Wilson.
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<pre>Hi,
We have been cursed by a quite severe dose of Anthracnose in our nevadillo
and it appears to be spreading to the Corregiola. We had the diagnosis confirmed
by Len Tesoriero at the Macarthur Agricultural Institute and were wondering if
anyone has had success in eradicationg this fungus?
Also I have heard anecdotal evidence of catching umbrellas mounted off the front
of quad bikes but have never seen one advertised. Does anyone out there know of
a manufacturer or distributor of same?
Regards
David Wilson
Glenlee Olive Grove


[Non-text portions of this message have been removed]
</pre>
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<pre>> Hi,
> We have been cursed by a quite severe dose of Anthracnose in our
nevadillo and it appears to be spreading to the Corregiola. We had the
diagnosis confirmed by Len Tesoriero at the Macarthur Agricultural Institute
and were wondering if anyone has had success in eradicationg this fungus?

Copper Hydroxide sprayed at the critical time cleaned a lot up for me. I
went from about a 50% infestation to 5% in one season (thanks in part to
Len's advise). The critical time seems to be once the fruit has formed and
is still small and green. No point in spraying before the fruit has actually
formed. January in the Hunter Valley.
I did also do a coper spray after harvest and another in spring, but the
target of these was Peacock Spot. However, these might have been effective
in reducing spore numbers?

I do find that the lower branches cop much more of a hiding than higher up
the tree, so there does seem to be some correlation between the fungal
spores over-wintering in the grass under the trees. I have found some trees
with bare earth under the tree and not a trace of anthracnose in a grove
heavily infested. I might be jumping to conclusions here, though.

I use copper hydroxide, but I gather copper oxychloride works just as well.
Both have NRA permits. I have heard of some people having no success with
copper and resorting to Mancozeb, which isn't registered for use in olives,
but I haven't studied their spraying regime. I have also heard of
anthracnose spreading from olives into grapes!

Regards,

Mike Wilson.
</pre>
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<pre>Has your leaf got black spots and withered up look? if so
I strongly urge to read the book produced by the South Australian Research
and Development Institute on Diseases and Pests - Grape Production series
book number 1 then refer to page 25/26/27 disease commonly known as BLACK
SPOT...
Disease cycle survives for at least 3 - 5 years in cankers. This is the same
as on grapes. further through this book also gives you a spray program for
NZ & Aust Try spraying with Delan Fungicide.
Hope this answers how and why.
good luck - Ron
----- Original Message -----
From: "Mike Wilson" <mike.wilson@...>
To: <OliveOil@yahoogroups.com>
Sent: Wednesday, 17 April 2002 02:49
Subject: Re: [OliveOil] Anthracnose


>
>
> > Hi,
> > We have been cursed by a quite severe dose of Anthracnose in our
> nevadillo and it appears to be spreading to the Corregiola. We had the
> diagnosis confirmed by Len Tesoriero at the Macarthur Agricultural
Institute
> and were wondering if anyone has had success in eradicationg this fungus?
>
> Copper Hydroxide sprayed at the critical time cleaned a lot up for me. I
> went from about a 50% infestation to 5% in one season (thanks in part to
> Len's advise). The critical time seems to be once the fruit has formed and
> is still small and green. No point in spraying before the fruit has
actually
> formed. January in the Hunter Valley.
> I did also do a coper spray after harvest and another in spring, but the
> target of these was Peacock Spot. However, these might have been effective
> in reducing spore numbers?
>
> I do find that the lower branches cop much more of a hiding than higher up
> the tree, so there does seem to be some correlation between the fungal
> spores over-wintering in the grass under the trees. I have found some
trees
> with bare earth under the tree and not a trace of anthracnose in a grove
> heavily infested. I might be jumping to conclusions here, though.
>
> I use copper hydroxide, but I gather copper oxychloride works just as
well.
> Both have NRA permits. I have heard of some people having no success with
> copper and resorting to Mancozeb, which isn't registered for use in
olives,
> but I haven't studied their spraying regime. I have also heard of
> anthracnose spreading from olives into grapes!
>
> Regards,
>
> Mike Wilson.
>
>
>
> *************************
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>
>
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>
>
>
</pre>
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<pre>> Has your leaf got black spots and withered up look? if so
> I strongly urge to read the book produced by the South Australian Research
> and Development Institute on Diseases and Pests - Grape Production series
> book number 1 then refer to page 25/26/27 disease commonly known as BLACK
> SPOT...
> Disease cycle survives for at least 3 - 5 years in cankers. This is the
same
> as on grapes. further through this book also gives you a spray program for
> NZ & Aust Try spraying with Delan Fungicide.
> Hope this answers how and why.
> good luck - Ron

Ron,

To the best of my knowledge Delan is not approved for use on olives in
Australia. It will probably work as will several other fungicides including
Mancozeb, but unless the NRA has issued a temporary permit you can't use it.

Susan Sweeney in South Aust has done a lot of work on behalf of the AOA on
permits, and would be the best to ask, along with Damian Conlan in NSW for
the Department of Ag.

Regards,

Mike Wilson.
</pre>
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