I just picked up and used some copper octanoate spray (copper soap). My understanding is that while it is considered organic, there is concern about build-up in the soil. So, I'm wondering what is the consequence of too much build-up in the soil? I'm thinking that it would destroy beneficial fungi or maybe too much copper would be absorbed into the vegetables. Am I on track?
I had to get a little more aggressive than milk, baking soda, or neem oil. It's been too wet this season.