Gencat have known about the problem since 2005 but appear to have done nothing to disseminate the information which might have prevented this devastating plague.
Treatment is a good idea as long as you start before any signs of attack appear but there's no guarantee.
Lots of info here :-
http://www.sospalm.com/index.php/en/
All the bits and pieces can bought at Sol D'Ebre but not much point in starting treatment until about March.