Whatever works for you is what you should use. Myself, reading the EPA's and other sites on Chlorothalonil & phosporous acid, I would feel as comfortable if not more, using the latter.
"If eschewing Chlorothalonil and watching your tomatoes rot on the vine in July makes you feel like a better person, good for you."
I don't recall making any kind of judgement on someone's decision to use Chlorothalonil or any other product. It's not my garden & makes no difference to me one way or the other.
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