Thanks for the replies, everyone. I appreciate it.
Guess I'll see how this tree does. Once I decided to expand the set of cultivars that I'm growing, I figured I'd sooner or later have FMV. All of my fig trees are in containers now. (The ones at my dad's house are in the ground). So how does FMV spread? Through the air? Or infected leaves/detritus, or the ground, or? Just trying to understand if there's any real point to trying to isolate that tree from the others or not.