Gardening

If you Google organic tomato fungicides, you find products by Safer, copper sprays, some use baking soda, some powdered milk sprays. There is no substitute for good garden cleanliness (mulch early, keep soil off of the foliage, use bleached containers, etc) - but in hot humid areas fungal attacks are inevitable. Even those who blast with chemicals like Daconil find it isn't at all foolproof...

I tend to be a non-sprayer - of anything. Then again, with 200 tomato plants, I've got lots of redundancy. Disease is far less an area of expertise for me than histories and varieties - my view is to play with Google, which may send you to places like Tomatoville and Gardenweb - where you can see what others do.

Good luck!