I recently trimmed back a rose bush (I believe it's a Liebeszauber Hybrid Tea Rose?) that sits in some shade in my front yard, as its branches grow pretty long and eventually start leaning into its neighboring shrubbery. The roses that had bloomed on it were now mostly wilted, so I removed them too along with the couple of remaining good ones, because I could then spray the entire plant with insect and mite control, as its leaves were getting eaten up pretty badly.
A gardener a year earlier had suspected a couple of the branches showed signed of rosette and that I should immediately trim them from the base so that it didn't spread further. I had it trimmed back pretty severely at the time, and it grew back really nicely. Being more familiar now with rosette than I was then, I have a question as to whether this bush is again showing signs of the disease.
I've just now noticed three really long branches shooting up above the plant:
This plant's new leaves usually have a red coloration to them, and they don't currently have an odd growth pattern to them, so nothing there is out of the ordinary. I've seen examples of really bad "witches' brooms" on rose bushes, and this doesn't have that. What I'm curious about, though, is the irregular thorn pattern on these new shoots. Again, it's nowhere near as bad as other photos I've seen of plants with rosette, but I didn't know if this is cause for alarm:
Is that normal for this type of rose when it rapidly grows back after being trimmed?
Update: here's an additional photo showing the base of the plant, per JStorage's suggestion that these are suckers from the root system of a rose graft: