the next picture shows healthy leaves

a picture of wilted new leaves

somehow the beginning of my message was cut off. As the pictures above show, the bottom leaves are dying off. I have removed most of the dead leaves, There are also grey and darker spots on the stems, which are pictured above. Would love some help identifying this problem as well as solutions. I read through a book I have on tomatoes and could not identify the disease with one in particular. As noted above,the plants are in pots which have peat, vermiculite and the other small glass rock. My home made equivalent of a earthbox.

sbslider, can you post a photo of the in-between stages: a nice close-up of what it looks like between the healthy plant stage and the totally dried-up leaves and moldy-looking stems stage?

I added a thread on GW's Growing Tomatoes forum (which gets much more traffic than this one) so hopefully you'll get a knowledgeable answer soon!

Looks like it may be gray leaf spot. Are your plants kept in a very humid environment?

Hi, thanks for the feedback. I live about 3-4 miles as the crow flies from the ocean, but there is a hill between me and there. I don't know what the typical relative humidity is but the plants are outside and exposed to the prevailing breeze that blows daily.