sick looking figuier brown turkey

[GUEPE]

i wonder if anyone can help ? our recently aquired fig tree has developed rust on the leaves is there a spray or something that i could apply to the tree to limit the damage?we have had loads of figs this summer and i don't want to lose it 45euroes !its definatly rust and not the dreaded ceratoelium fici .if i understand it correctly its a root desease .thanks for any guidance john.