Yes, nematodes are a pervasive problem in a lot of our state... they love our beach sand.
It is an old Southern tradition (and probably up North, too) to plant a fig by your house. My grandfather always told me they liked their roots to be cool. The more Ive thought about it, and knowing that Nematodes actually have to have sunlight to survive, I'm beginning to think that the fig trees also like having a root structure in a Nematode free (or 'freer') zone as well.
As you build up your soil with nice rich compost you will see a reduction in your nematode problems as well. Ive noticed that over the years as I continuously work on enriching my soil.
The LSU purple fig is a good one for our state... supposedly nematode resistant roots and , when it matures, you will get three crops a year.
If your tree stresses, dont worry too much. Our growing season is so long that they usually bounce back pretty good from a lot of assaults ... which is a good thing because with our climate, soil conditions, bugs, etc etc etc there's always something to contend with :)
Now that they've found Nile Crocs in the southern portion of the state, and the Boas are running amok, Im just waiting for the other shoe to drop and have them develop a taste for figs (or fig fanciers)