Another plant.

This post was edited by enosbg on Fri, Jun 7, 13 at 14:59

Different plant and look

Detailed leaves and stem. Dark brown covering much of the surface area of the leaves. The leaves didn't curl but simply died.

Here are all of the photos in one place:

The bright yellow leaf color points to glyphosate, the active ingredient in Roundup & a number of other weed killing products.

From the picture, depicting the soil surface (with a lot of stones,..), I think that the soil is both POOR and too sandy. As a result, the plants are not getting what needed. Drooping / wilting( as seen in one picture) can be due to thirst in a hot sunny day. Simply put, they are struggling.

I would clear out around the plants(by hands , wearing gloves), get rid of the stones bigger then hazle nut(better yet, by screening through a 1/4" mesh screen,) Then add and mix a lot of compost and manure ... and finally MULCH IT MULCH IT MULCH IT. Of course, it should have been better if you had prepared the soil (or at least spots that you were going to plant tomatoes), before planting to a radius of one foot and a depth of at least one foot , before planting.

These are things that come into my mind by looking at your pictures.

I agree with Jean. It looks like a little Roundup drifted over onto the plant.