I forgot to add - the leaves do not have blotches or yellowing

I am in a panic about this same problem. My grape tomato is really going down the tubes in a hurry. I noticed the wilt 2 days ago and now a couple of branches are close to dying. Now I think a couple of other tomato plants are doing the same thing. A giant pumpkin vine is wilting-probably has squash bores or something hopefully not related to my tomato thing.

We've got the wisconsin blues for sure. We wait and wait for fresh veges and then the bugs come or the blight.

I drenched all of my tomatoes with a 10% milk to water solution yesterday morning and I think things look better. Perhaps our problem is weather related-we've had a little rain and hot hot hot weather. Let's hope it is not terminal for out tomatoes