I've looked everywhere and can't find pics of what my tomatoes are doing. I'm not sure if it's a disease or maybe nutritional. The edges of the leaves are turning yellow and even white. The plants appear to be healthy otherwise. So far, it's only affecting the ones I grew from seed. The ones I bought seem to be okay. No, I take that back. I have some sitting on the front porch that I haven't planted yet and they are starting to do the same thing. We've had more than enough water. I use a tomato specific fertilizer. I've been spraying with Daconil for the fungal problem I usually have. (But so far not this year.) Any ideas?