Spanish olive groves are at risk of being wiped out by a strain of “olive ebola” which has ravaged the crop in Italy.

The bacteria Xylella fastidiosa, believed to have originally come from the United States, has torn through southern Italy since it first appeared in late 2013.

Dubbed “olive ebola” by a Blanca Landa, a researcher at the Institute of Sustainable Agriculture, is threatening to wipe out decimate entire groves across southern Spain.

Landa told Spanish daily newspaper ABC: “The Italian outbreak is very virulent. The bacteria’s virulence in olive trees is unprecedented.

"It is unforgiving. The Italian farmers we met told us they had taken better care of their olive groves than their children and now they are irrevocably damaged. In barely a year it can wipe out an entire plantation.”

It is causing serious concern for Spanish officials as Spain is the biggest olive oil producer in the European Union.

There is no cure for the disease, which causes "olive quick decline syndrome", and all affected trees must be felled.

At the end of April when the EU’s agriculture body, Standing Committee on Plants, Animals, Food and Feed (Paff) asked Italy to cut down its affected trees to stop the disease spreading further.

Italian authorities will now be required to test all olive trees in a 20km zone adjacent to affected areas, Brindisi and Taranto.

If any places test positive, all olive crops within a 100m radius must be destroyed.

But these harsh measures have been criticised by Roberto Moncalvo, the president of Italian agricultural group Coldiretti.