Organic disease control methods?
I am doing my first serious tomato growing this year, and I usually do things organically. I have been growing vinafera grapes organically for a couple years now, and I have been moderately successful even though they are famously disease-prone in our hot, humid weather.
Are there any good resources for organic disease control, or lessons you have learned? I am very familiar with the usual organic sprays, namely copper, sulphur, summer oils, and soaps. Also I use seaweed and fish emulsion sprays and have the plants well composted. The best website I found was the ATTRA page, see below. It has a table at the end of disease treatments, but the summary is more or less "copper, copper, copper". In the organic and low-impact grape growing world there are many new disease treatments, i.e. Kaligreen (potassium bicarbonate), phosphorous acid, stylet oil, Serenade, etc, but there doesn't seem to be a similar effort in the tomato world. Or maybe they have tried and there are no big successes so far.
Here is a link that might be useful: ATTRA organic tomato