This too

I don't see any spots or specks that would indicate a disease (either fungal or bacterial). If it's just the lower leaves, they do that with age. If more than a few (hard to tell from 1st photo - is that sun glare or are the upper leaves on the half of the plant near the fence yellow?), could be insufficient nitrogen. The leaves at the top of the plant (left of photo) in 2nd photo/post look healthy. Can't say why fruit tasted bad, could just be the variety.

What's in the new mix besides peat? Have you tested it? Have you fertilized? How big is the bed and how many plants do you have in it?

Looks like a lot of suckers/foliage crammed into a 3-ring tomato cage. While it doesn't look like disease from what I can see of the leaves, you could prune a little for better air circulation, esp. given the rain we've had lately.

This post was edited by ajsmama on Fri, Jul 5, 13 at 11:42

No signs of any disease in the photos.

The yellow leaves are caused by a) over-watering or b) salt build-up in your soil from excess use of high salt fertilizers, or c) nutrient deficiency (usually magnesium and/or nitrogen), or d) skewed soil pH that prevents nutrient uptake.

Dave