It's been a cool at wet spring here in the Northern Central Valley of California (near the Bay Area). And now one of my tomatoes has some kind of disease.

The affected tomato is a Brad's Atomic Grape we grew from seed. We have 3 more of these in a different spot. but this one seemed to be doing the best until the leaves started looking wilted. Then the young leaves started dying back from the edges. So far the stems and unripe fruit seem to be unaffected. (No fruit has ripened yet.)

It looks a little like late blight or maybe spotted wilt?

But it does look like this post, which people decided was Fusarium Wilt.

https://www.houzz.com/discussions/5417990/my-brad-s-atomic-grape-plant