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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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