Disease resistant red floribunda for a container?
I am an experienced container gardener who is new to roses. I grew a beautiful "Showbiz" floribunda in a 10-gallon container last summer and fell in love. But it was plagued by black spot after the first month and lost most of its leaves at six weeks. I treated it with Orthenex and sulfur as soon as symptoms appeared, but never was able to overcome the disease. The plant also was a magnet for Japanese beetles. It continued to produce a few small blooms all summer, but looked quite pitiful.
I'd really like to try again. I only have room for one bush in the area of my yard that gets more than a few hours of sun. I would sure appreciate advice on what rose to try and what to do to keep it healthy. I'd like to find a disease resistant bright red rose online. Please help.