Hi Alfa,
I am not one of the most experienced growers here but I went through something similar. Can you post a picture of your plant top to bottom as close as you can. Do all your toms show the same symptoms. You have tried the three prong approach (nitrogen, fungicide and insecticide). Tell us your watering, fertilizer regimen, soil type and ag-zone. That will help with finding out what is going on. With that info the tomato kahunas can zero in. Thanks. Aloha.

I will try to get a picture like you suggest soon. Most of my toms do show these symptoms, some worse than others. It definitely hits the bottom first and moves upward. The upper half of the plants are nice and dark green. If you haven't checked already, I have more detailed info in the thread linked in my original post above.

1) growing in straight compost (about half is composted cow manure), raised beds
2) watering has been kept to a minimum - we had a pretty wet may here in MO. I have not watered them much from fears I may have over-watered in the past.

I held off on fertilizing until about a month ago. Early on I began neem once a week up until a month ago. So since approx 1 month ago:

3) Hit them w/ a good dose of N, and have been doing the MG thing at least once a week since then (at the roots).
4) Changed from neem to insecticidal soap every few days along w/ daconil every 5-7 days.

I'm trying a variety this year and this appears to be hitting most if not all of them. Big Beef, BHN 640, Celebrity, Carnival, Carbon, Cherokee Purple, Bush Early Girl, JetStar, Black Cherry, Sugary

Thanks again!
Joe