There are no known cultivars of olive that are resistant to X. fastidiosa.
Phylloxera attacks the root, and so grafting with resistant stocks protects the scion.
In the case of X. fastidiosa, the bacteria can spread on the whole adult structures of the plant when infected vectors feed on the xylem, so grafting is not a solution.
In Portugal, Phylloxera became a synonym for madness, since the losses were colossal. I fear that Xylella fastidiosa might become the next "madness"...
Phylloxera attacks the root, and so grafting with resistant stocks protects the scion.
In the case of X. fastidiosa, the bacteria can spread on the whole adult structures of the plant when infected vectors feed on the xylem, so grafting is not a solution.
In Portugal, Phylloxera became a synonym for madness, since the losses were colossal. I fear that Xylella fastidiosa might become the next "madness"...