There are no known cures for this disease, and once infected, the plant slowly dries up (though some infected plants manage to survive without showing symptoms). There are several strains of Xylella, and together they affect 595 plant species worldwide at the last count. Over the past century, Xylella has decimated orange fields in Brazil, vineyards in southern California, and pear trees in Taiwan. Then, 10 years ago, Xylella reached Puglia's olive trees.
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