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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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</pre>
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