Rust on Callirhoe Involucrata (Mallow)
Asked June 15, 2019, 12:19 PM EDT
It appears that I have rust on my Wine Cups plant. I live in northern Minnesota and we have had a cool, wet season so far. How do I treat it?
Hubbard County Minnesota
Following is information about plant rust and ways to control it.
Because it is a native wildflower, wine cups probably won't be listed on fungicide labels.