It's possible they are less wilted in the morning, but if they are, it's pretty negligible. They are definitely wilted in the morning too. I'll have to pay closer attention to the severity.
In the early afternoon, they look like this:
Here's a good overview of the wilt.
And this is a shot of the base of the plant. The leaves are turning yellow. I didn't notice that yesterday. It might be new. That dead branch is broken, so it's not dead as the result of the disease.
And this is a detail of some leaves with brown spots on them. Not dirt.
