My tomatoes had been doing great growing huge and putting on nice fruit. The last few weeks however they have started looking worse and worse.

It seems like there is a pest problem, the leaves have lacy holes on them, but the lower leaves seem to be yellowing and dying without being eaten by this pest. I have purple Cherokee and a few different hybrids - all indeterminate.

Here are the pictures:

This was a week ago:

This is today:

I already lost one whole purple cherokee plant. The rest seem to be headed in the same direction. Please help.