look up grey mold

Linda, I was suspicious of that also. There isn't the fuzzy growth on the underside of the leaf. I even put an affected branch in a baggy with a damp paper towel overnight, and no mold growth. So I sort of ruled that out. If it is Gray mold, wouldn't a regular fungicide regimen have kept it contained somewhat? It just keeps marching on.
Jennie

Also, I did have grey mold on one of my dwarf project tomatoes. The foliage is so dense it created an airless environment it the center of the plant. I thinned the foliage dramatically and sprayed a fungicide religiously and contained it. So I know what grey mold looks like. And the disease on this plant looks nothing like that.

I do as Jennie has said.
Most bacteria and fungi thrive in moist stagnant environment. That is where pruning excess foliage, especially the lower ones makes sense to me.
Yeah, religiously fungal spraying pays off. TRy to spray from the underneath as well as from the above. Keep your plants dry. I know, you cannot help it when it rains a lot. But thinning, pruning can help to provide air flow and dry the foliage.

Could it be from chemical drift from nearby. Cut the stem after harvest to see if there is any discoloration. Do you spray early in the morning or late afternoon?

Thanks all. Lycopenequest, I spray in the early morning before the sun hits the plants. It isn't chemical drift from nearby, I lost almost all my tomatoes one year from herbicide damage, so know what that looks like. I am beginning to think Linda is right and this is Grey Mold. This plant sits in the back of the garden so gets much less wind and airflow than the other plants. I am getting a touch of it on the other plants, but I am able for some reason to contain it on those. The dwarf with the very dense foliage started out with white spots and then got the brown areas with visible fuzzy growth. But the end result of the leaves looks identical. So I think it must be grey mold and probably this plant suffered more as it was at the back of my garden. Thanks all,