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Monoculture was not the cause. From TFA:

"The origin of the Xylella outbreak in Italy can be traced back to a single coffee plant imported from Central America in 2008. Researchers found that the bacterium in the infected coffee plant adapted to thrive in olive trees, setting the stage for the crisis that would unfold over the next decade. By 2015, the disease had spread beyond Apulia, affecting regions across France, Spain, and Portugal. The rapid spread of this bacterium has left scientists and farmers alike scrambling for solutions."



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