Interesting thread. As most of you know, I garden from October transplants to about late May, or June. That is the only time it is cool enough here in S. FL. For the tomatoes to set fruit. In this environment, I use a weekly preventive copper spray, it works really well. I use at 1/2 of the weakest recommended dilution for tomatoes, and I have good fungal management. And we get lots of fungal pressure here in the humid sub tropics.
I garden in containers so my fungal spray is mostly contained to them, not the native soil.
Oh, and we really dont get late blight here, but lots of early blight , septoria, grey mold, and all sorts of bacterials. Copper, and also Neem handle those well. Neem is a good insecticidal spray for soft bodied bugs too.
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