Ok so after spending way too much time on this, I think this will be the formula.
chlorothalonil + phosphorous acid (catamaran-esque tank mix) (daconil + exel lg)
Alternated with
Actinovate + copper octanoate (copper soap)
Spray one combo at 7 day intervals, subject to increase as disease pressure ramps up.
My first copper choice was a copper hydroxide (champ or kocide)but I dont need 20lbs of it.
I always used to wait till some foliage disease was present to start treating. Boy did the research open my eyes to that folly.
Fungal spray available to the home gardener is preventative only.
For anyone else looking into this, bravo is chlorathonil, kocide.and champ are copper hydroxide. Any fungicide trials will use those commercially labelled names.
There is very little info I could find on septoria efficacy trials, mostly late blight.
First septoria spots showed yesterday.
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