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<pre>Hello the list

Here is a picture of an unknown disease appeared on one of my trees. It
looks like tumours. It develops on branches touched by an old hail. But
why only on one tree? Thank you to communicate your appreciations to me.
Any suggestion will be welcome. By the way, should I cut this branches
or what ? You can find the picture of the monster in the “photo”
directory.

Best regards

Saâd Tazi, olive oil producer
Rabat, Morocco


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<pre>Hello Saâd

Your plants are infected with the bacteria Pseudomonas savastanoi pv.
savastanoi. It's a natural occurring bacteria that is present
generally on all olive plants, it infects the branches trough wounds
and colonizes the tissues producing plant hormones that originate the
uncontrolled growth you have seen. In extreme cases it can also infect
leaves and fruit, but this is very rare. The resistance of olive
cultivars to this patogem varies greatly, thats probably why there is
only one plant in your grove that presents the symptoms, because this
plant probaly is of a different cultivar.
There is no treatment to this disease, the only thing you can do is to
cut the branches paying attention to disinfect the scissors before
using them in a wealthy branch. When another hail storm occurs damaging
the branches you can prevent infection by treating the tree with copper
sulfate, that will disinfect the branches preventing infection (note:
you have up to 4 days after the hail storm to treat the plants).
Our Australian friends can relax because this patovar doesn't exist in
Australia, where its only present the pv. nerii, a patovar with a very
low virulence towards olive tree.

Regards,

João Correia


>
>
> Hello the list
>
> Here is a picture of an unknown disease appeared on one of my trees.
> It
> looks like tumours. It develops on branches touched by an old hail.
> But
> why only on one tree? Thank you to communicate your appreciations to
> me.
> Any suggestion will be welcome. By the way, should I cut this branches
> or what ? You can find the picture of the monster in the “photo�
> directory.
>
> Best regards
>
> Saâd Tazi, olive oil producer
> Rabat, Morocco
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
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