You guys are on to a topic that I have been wondering about for awhile
now. I have a small rose garden in the front of my yard, which contain
7 rose bushes. All bushes appear very healthy, except for one near the
middle. Every year, it starts out ok in the Spring, but by Summer it
has developed the Black Spot that you are speaking of. No amount of
spraying, or treatment has brought it out of it. Then the following
year, it begins the cycle all over again. The first blooms of this
bush is amazing, they are absolutely abundant and beautiful, but the
bush does frustrate me.
I'm thinking of simply digging it out, and replacing it with another of
the same variety. . .Whatya think? Could this just be a weak bush,
that is more problem than it's worth?