Canna rust

Marlboro, NJ

Can anyone please let me know what the best fungicides would be to spray for canna rust. I have been using a Bonide copper fungicide with limited success. Any place I find those orange spores on the plants gets cut away and destroyed. All tools used are sprayed with bleach between cuttings to prevent transferring anything from plant to plant. I have upwards of 650 plants so I need something that can be put in a two gallon sprayer and mixed with water.
Thanks in advance.

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