It's an acceptable way to help manage fungal issues.
I wouldn't pull your plants unless you can get someone like your local extension office to CONFIRM that it's bacterial. Fungal issues just happen here, not much you can do about it, but keep up on the removal of the affected leaves, and practice good sanitation between plants.
I personally don't use copper based products. The worms don't like it. I would also use caution when mixing copper based sprays with other products, as it can cause burning.
On the bright side, I hope it's just poo!
USDA Zone 7b/ Sunset Zone 31