If you have a rose that once was a delicate pink or a sunny yellow and is now a dark red, you may be dealing with 'Dr. Huey.' Many roses are grown on 'Dr. Huey' rootstock. Then 'Dr. Huey' survives (or takes over) the other rose. I have a 'Dr. Huey' where I once had a 'Therese Bugnet.' I don't think there is anything left of Therese. I'm not really sure why she declined so unless she was just shaded out by a growing crepe myrtle. By the shed (which I call the barn, which now has a new layer of shingles which finally match the tan exterior after 18 years of dove gray shingles clashing with a light tan paint), there is a 'Dr. Huey' that is trying to take over a declining yellow rose. I planted the yellow rose for my husband since that is his favorite color. I see one stem in the center of the plant that looks a little different. As long as there is any yellow rose left, I will try to tear out the 'Dr. Huey.' 'Dr. Huey' will probably get to stay where 'Therese Bugnet' was. I miss her spicy fragrance.
'Dr. Huey' is very susceptible to black spot, especially later in the season, but right now, he's the star of the show.