You seem to have a very mild, if not very early start, of the same symptoms I wrote about in my thread titled "Disease, overwatering or lack of nutrition." I seem to recall the yellowing of the leaf tissue was the beginning while the veins stayed green, followed by death of the outer leaf edges. Not sure we have the same issues but I'll be interested to hear how others respond to your thread. Still awaiting a response to mine. Good luck.

Teresa

Hi Teresa,

Good luck in finding a cure...They do look very alike.

And to tell you the truth, after taking a loot at the Tomato problem solver and google, it looks just like powdery mildew of tomatos. I believe that is what is wrong with mine after viewing some pics

Do not overlook insect damage as I did. I treated for foliage disease for 2 years only to determine it was mite damage. Search the forum for insect damage.

Have you considered nutrient deficiency? I have been having similar problems, and I eventually just called a bio grad student buddy of mine and asked him to test some samples to see what was going on. He told me that there probably was nothing wrong, pathogen wise, but that my soil lacked many of the proper nutrients (magnesium, apparently).

Just a thought. I'm curious to see what others say, but that is where I've been pointed.