Then definitely don't use any chemicals on them.
Have you tried planting the disease resistant types of tomatoes and are they still failing?
yes, and Im trying like four different varieties this year...and the tomato-tone isn't chemical...
I don't use anything chemical for anything for my plants
I have the craziest compost pile you've ever seen and I use coast of maine, bumper crop, organic choice and espoma products on my stuff
if I ever get bugs I go to the garden center locally that sells bugs to eat the bugs..lol