There are apparently several different strains of fusarium, each one attacking a particular kind of plant. You should be OK to plant an unrelated crop in that area.

How is fusarium wilt diagnosed? I have trouble distinguishing the various tomato leaf diseases.

Jim

I've known fusarium wilt to start from the bottom of the plant and work it's way up. I was hit with it last year.

You will notice some yellowing/spots on your very bottom leaves of your plant. Eventually the bottom leaves will completely shrivel up and turn brown just like they do at the end of the season. As this continues, the fusarium wilt moves up the tomato plants and affects all leaves.

I did notice that it seems to leave the fruit alone so the fruit can be fully ripened, but the leaves are affected and without leaves, photosynthesis won't occur and kills the tomato plant.

The are I had the fusarium wilt last year is home to cucumbers and potatoes this year - and they all did fine. There was also some lettuce and green beans in the area as well - and they all seemed to grow fine.

Here is a link that might be useful: BsnTech Gardening Blog