Quote:
Originally Posted by Nematode
Copper octanoate
Daconil.
Neither are organic.
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Copper octanoate formulations are frequently OMRI listed, so it can be organic.
Quote:
Originally Posted by ginger2778
Better get the copper spray going as soon as you trim off and bag up mist of those infected leaves. Use the WEAKEST recommended dose of copper in your spray, it will be plenty strong enough. Too strong will stunt new leaf growth and put you back 3 weeks delayed. If it looks blue on your leaves it is too strongl.
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I use copper octanoate at the standard recommended dilution and there is always a bluish residue on my leaves, and I have never had problems with stunting of any kind on my tomatoes until I had an herbicide drift incident from my neighbor this year. I know it was herbicide that was the problem because it also took down my peas and my neighbor's hawthorn bush, neither of which were sprayed with any copper at all.
I suspect it matters what kind of copper you use.