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The wide occurrence of fungi and their aggressiveness could explain the vast
majority of symptomatic olive trees sampled and resulted in negative for the
bacterium.
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It is possible that in the infected areas of Salento, Xylella fastidiosa occurs to a
great extent but what is observed is that phytopathogenic fungi are also
contemporaneously present in the same tree that hosts Xylella fastidiosa.
A more comprehensive approach to the study concerning the olive decline should
be to also consider other phytopathogens involved in the complex disease currently
affecting olive trees in Puglia.
It should be added, that, nowadays, many pathological emergencies that affect
woody species are caused by a number of phytopathogens that can act between
them and in combination also with abiotic predisposing factors.
In any case, in Salento, neither Xylella fastidiosa nor OQDS could have killed “tens
of millions” of olive trees, considering that in the province of Lecce, the olive
trees are estimated to be “only” 11 million, and many of these are still visibly
healthy and productive. Therefore, this narrative is absolutely unfounded.
A second aspect of the rebuttal concerns the low incidence of Xylella fastidiosa in
the demarcated areas. We do not deny that the aim of the monitoring surveys is
to find infected trees and that a low occurrence of the bacterium has to be
expected within the “buffer” areas. We point out the unnecessary sacrifice of
asymptomatic centennial and millennial olive trees that surround the infected one
within a radius of 50?meters.
According to epidemiological models that revealed “the negligible role of the
asymptomatic trees” in further spreading the disease, the additional uprooting
would not seem useful.
It should also be added that the “blind” tree uprooting, irrespective of the real
occurrence of the bacterium within the olive crown, appears quite obsolete,
especially by taking into consideration the great number of very sensitive and
reliable detection techniques recently developed for Xylella fastidiosa.
Moreover, many autochthonous olive trees in Salento, which have been infected
since 2015, are perfectly healthy and productive today.
- 435 -
majority of symptomatic olive trees sampled and resulted in negative for the
bacterium.
Discover the world's top brands.
World Olive Oil Ranking
It is possible that in the infected areas of Salento, Xylella fastidiosa occurs to a
great extent but what is observed is that phytopathogenic fungi are also
contemporaneously present in the same tree that hosts Xylella fastidiosa.
A more comprehensive approach to the study concerning the olive decline should
be to also consider other phytopathogens involved in the complex disease currently
affecting olive trees in Puglia.
It should be added, that, nowadays, many pathological emergencies that affect
woody species are caused by a number of phytopathogens that can act between
them and in combination also with abiotic predisposing factors.
In any case, in Salento, neither Xylella fastidiosa nor OQDS could have killed “tens
of millions” of olive trees, considering that in the province of Lecce, the olive
trees are estimated to be “only” 11 million, and many of these are still visibly
healthy and productive. Therefore, this narrative is absolutely unfounded.
A second aspect of the rebuttal concerns the low incidence of Xylella fastidiosa in
the demarcated areas. We do not deny that the aim of the monitoring surveys is
to find infected trees and that a low occurrence of the bacterium has to be
expected within the “buffer” areas. We point out the unnecessary sacrifice of
asymptomatic centennial and millennial olive trees that surround the infected one
within a radius of 50?meters.
According to epidemiological models that revealed “the negligible role of the
asymptomatic trees” in further spreading the disease, the additional uprooting
would not seem useful.
It should also be added that the “blind” tree uprooting, irrespective of the real
occurrence of the bacterium within the olive crown, appears quite obsolete,
especially by taking into consideration the great number of very sensitive and
reliable detection techniques recently developed for Xylella fastidiosa.
Moreover, many autochthonous olive trees in Salento, which have been infected
since 2015, are perfectly healthy and productive today.
- 435 -
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