I hate rust.
I consider my operation organic.
Copper is slowly being kicked out of the organic family in countries in Europe, for example.
I want to harvest leaves for tea to treat my diabetes and to allow others to try the tea as well.
I can not do this if the leaves are butt ugly with rust.
BUT - I also can't spray a bunch of copper and then harvest leaves either.
Folks have been claiming copper is a safe and organic treatment for decades but it is not. Well at least it is not completely harmless.
The issue is not a simple one and soil beneficials (bacteria, microorganisms, etc.) can be easily wiped out by copper, for example.
I'm not going to climb up on my soap box on this issue one way or the other (here at least) as I'm not an expert and my level of knowledge on this subject is "mid-level" at best.
I do know it should be of concern to anyone using copper but whether my level of concern meets other's level of action is the question.
Just please do not buy the hype that copper is a completely safe and organic way to treat rust.
But,
How safe is copper? I don't know. That's the simple answer.
How toxic is copper?
Should you stop using it? --- I don't know. I have never used it and do not intend to ever do so.
I am concerned about the fact our government does not protect us from ingesting hundreds if not thousands of toxins and doesn't test or plan to test a very very long list of dangerous substances we are exposed to every day. Where does copper land on that list. I don't know.
So,
Please do your homework and please try not to poison your friends and family - at least not on purpose.